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View Full Version : Need some help with my tank and lack of coral growth.



hanknmorgan
Mon, 14th Apr 2008, 11:58 PM
This is a long post, but I appreciate the help if you dont mind reading it all.

I have a 12G nanocube that has been up and running for about 15 months now. While it has done well in that most things have survived, it really hasnt shown much progress in the way of growth. I have had very little, as in barely noticable, coral growth at all in the last year. Very bizarre as I have a pretty good setup and take good care of the tank. Any input or advice would be very appreciated.

Setup.

The tank has a variety of small frags most of which came from fellow maast members about a year ago. We have some xenia, a couple acro's, a couple monti's, torch coral, mushroroms, a few zoas, and a bubble tip anemone. All the livestock is small frags and the tank looks unfortuately bare. A few snails and crabs for cleanup, and two false percs.

Lighting is a 70w 10k ushio with 32w PC actinic. This setup was added 10 months ago.

about 20lbs of LR 1.5" sandbed. I run filter floss, LR rubble, purigen and chemipure in the rear chambers along with heater and pumps. CPR backpack skimmer was added about 5 weeks ago. I have a maxijet 900 (230 gph) with a hydor flo rotating thing and a rio 180 (120 gph) for return and circulation pumps into the display. The large (for the tank) skimmer also serves as the fuge full of cheato that was previously in the rear chamber until the skimmer was added. It is lit by a small flourescent bulb. Have had the cheato for a year and just rotate and thin it out when I do what changes.

I dose some bionic to keep calc and alk in check. Water temps and parameters have always been great. I dont test water like a crazy psycho, but I do fairly regularly and it's always right on. I have also had it tested at several different LFS's in the past at different times. Nitrates, phosphates, alk, calcium, salinity, temps are all in check. I use Instant ocean salt and RO water from the LFS. I feed very lightly. 2 gallon water change every 2 weeks. Lights on 12 hrs a day. Halide on for 10.

Ok, so I have done some research and have the tank setup fairly well. I'm not a fish tank newb, but no expert. All of my corals started as very small frags in hopes of them growing and filling my little tank quickly. A year later I have negligable growth. The montis and acros have grown a little over the rock at their base and some branching and tip growth. The Xenia has grown very little, and torch torch coral very little. Mushrooms have done nothing and zoos have done absolutely nothing. Everything is nice and spread out in the tank so there isnt any coral combat going on that i can see. Everyone seems and looks happy just wont grow at all. The anemone is about 4 months old and it was really small when we got it. It doubled in size in a few weeks (now about 5" when open) and hasnt grown in months, but seems ok. Not thriving though I guess. Clowns love it though. I keep seeing pictures of peoples tanks at 1 year that are just busting with coral that has grown on the rocks, glass, everywhere. What am I doing wrong. The tank started stock and all the mods except the skimmer we done in the first 6 months and I just let it do its thing other than routine maintenance for 10 months with nothing to show. Its fun to watch and always looks great, but I really want some growth to fill out the tank and do some fragging and trading.

Any ideas or suggestions would be greatly appreciated. Thanks for your time/help.

-Hank

Texreefer
Tue, 15th Apr 2008, 12:37 AM
I would like to see some actual numbers on alk cal and mag to make sure these are in balance,

Fish4life
Tue, 15th Apr 2008, 07:05 AM
and phosphates. if your phospates are too high you will get slow stone growth.

cheers,

kurt

alton
Tue, 15th Apr 2008, 07:27 AM
Sounds like with all the filters Chaeto, Chemi pure, filter floss your water is too clean?Remove the filter floss, try a couple of water changes using Red Sea Pro (What I consider to be a dirty salt)

Bill S
Tue, 15th Apr 2008, 09:40 AM
I'd agree with Alton - you might be too clean.

BTW, I can't grow LPS or softies in my big tank. SPS does fine, but the others don't. Torch/hammer hybrid does ok, and mushrooms do ok, but that's really all.

Gilbert
Tue, 15th Apr 2008, 10:21 AM
i do water changes every two weeks and use instant ocean and i also see little growth.

hanknmorgan
Wed, 16th Apr 2008, 10:51 PM
Thanks for the input everyone. Gilbert, sounds like my tank. Maybe I will try a different salt as I am just about out of my bag.

Just ran a batch of tests this evening. Sometime the color scales are difficult to differentiate, so if looked to be between two colors on the chart, I put the range.

Phosphates - 0 ppm
Nitrates - Between 0-5 ppm
Calcium - Between 360 and 380
ALK - Between 10-11 dkh
Salinity - 1.0235
Temp - 81 at end of days light cycle

I have an aquarium pharmaceuticals reef master test kit. Probably not the best, but the couple times I had the water tested at the LFS, the numbers were consistant with my home test. I dont have a refractometer. I use a coralife deep six hydrometer. I had it calibrated at the LFS a while back with thier hydrometer and it was slightly off. So I add the correction factor when testing. I have a cheap little suction cup aquarium thermometer, brand unknown.

I am going to do my water change now as I am slightly overdue. It has been almost 3 weeks and I usually do them every 2 weeks.

If any of that looks like a serious warning flag or any ideas, please let me know. I have grown rather frustrated with the tank. I had zero algae for a year and now I do have some red algae on the sand and bottom of some rocks that doesnt seem to want to disappear. I do need some more cleanup crew though. I'm down to like 3 crabs and 3-4 snails. I had about 6 and 6 originally but over the 15 months they have dwindled slightly. The fish seem happy. Coral looks normal, but not growing as usual. However, my anemone seems not as happy the past week or so and doesnt open up as much and seems to be a little lighter in color than it once was. I am do for a bulb change soon though, so maybe thats the culprit.

I just find it weird that adding the halide seemed to make no difference in growth compared to my year and half old stock nanocube PC's. I got the tank used. The skimmer, while it pulls some stuff out doesnt appear to making any noticable difference either after a month. The cheato grows pretty steady and I have to thin it out about once a month. I'm out of ideas. Just disappointed mainly. What else should I try. Thanks.

-Hank

Bill S
Wed, 16th Apr 2008, 11:31 PM
Hank,

Deep six the deep six. While you may have had it calibrated, they are notorious for gradually gettting worse.

I guess my other question is, what are you feeding? I tend to overfeed, and pay for that with constant battles with nitrates & phosphates. But, my SPS grows well and has great color.

hanknmorgan
Thu, 17th Apr 2008, 12:17 AM
Yeah, I know hydrometers suck. I just cant afford a decent refractometer. I have wanted one for a while and I guess I will need to add that to the list sometime. I guess for now it wouldnt hurt to have my little deal calibrated again. As far as food, I have some mysis and brine cubes and some formula one flakes. I usually feed every 2 to 3 days, 3 more often and alternate between the 3. I also have some silversides that I got for the anemone. I was giving it a little piece every now and then but I noticed it spit it out the next day on two occasions, so I usually thaw a little extra mysis or brine once the clowns start slowing down I squirt the rest into the anemone with a syringe. It usually responds quickly and closes up and catches the majority of the shrimp. I dont feed the corals or anything. I have read and heard on both sides of the argument to do so, and just opted not to for money sake primarily, but I if it would help I can give something a try. Thanks.

hanknmorgan
Thu, 17th Apr 2008, 12:21 AM
Double Post. Sorry

barderer
Thu, 17th Apr 2008, 03:21 AM
you need to feed the corals. Considering your anemonehas doubled in size in you small tank I would say you water is very clean as anemones are very sensitive to poor water quality. However, you are direct feeding the anemone which is good, and is why it grows. Many corals ideal for the aquariums are not best suited to grow just on light as they are usually deep water species...USUALLY...especially selections for a biocube or smaller tank with weak lighting. In other words you need to feed your corals if you want faster growth.Feed the various phytoplankton, zoo etc. Things like Xenia and other filter type corals do really well in slightly more "nutritious" water. :)

junkstang
Thu, 17th Apr 2008, 07:47 AM
you need to feed the corals. Considering your anemonehas doubled in size in you small tank I would say you water is very clean as anemones are very sensitive to poor water quality. However, you are direct feeding the anemone which is good, and is why it grows. Many corals ideal for the aquariums are not best suited to grow just on light as they are usually deep water species...USUALLY...especially selections for a biocube or smaller tank with weak lighting. In other words you need to feed your corals if you want faster growth.Feed the various phytoplankton, zoo etc. Things like Xenia and other filter type corals do really well in slightly more "nutritious" water. :)

i agree i think the tank is just to clean. i would say you need to pick between water changes and having a skimmer.

ErikH
Thu, 17th Apr 2008, 10:29 AM
If your zoas are not growing at all, you water is more than likely too clean. Water changes with Reef Crystals may help, it seems to be a help in my tank. I am now running my skimmer only at night because I too was having problems with growth. Sine I changed those two things, alot more has seemed to go on in my tank. Those little nanos usually throw up zoas they grow so fast.

tony
Thu, 17th Apr 2008, 03:25 PM
how can you not afford a refractometer? $45 for piece of mind is well worth it. do a search for some of the swing arm hydrometer horror stories, there are many.

even a $10 floating hydrometer would be better than the swing arm

Bill S
Thu, 17th Apr 2008, 07:55 PM
Yup. Like Tony says. I ONLY own floating hydrometers. The good ones. NEVER a swing arm or anthing mechanical.