size of circulation pump

[Dustoff79]

I have a 90gal tank, 4' long. I have come to the conclusion that I have a circulation problem. how many and what size circulation pumps should I have. I am thinking two Hydor Koralia Evo 750gph on opposite ends generally pointing toward each other to cause a disruptive flow. any thoughts.

[jrsatx20]

i would do the koralia evo 1400 X2. i just got a 1150 for my 30 gallon. i had so much detrius before and didnt notice till i hooked this up what a diffrence.

[CoryDude]

Depends on what you're keeping. Do you have a sump also? What size pump are you using for that?

Personally, I think that size evo is going to be a bit small, but I keep sps which need more flow. I had 2 maxijet mods on each end of the same size tank and it seemed to be more than enough flow. Those put out about 1200gph each. A tank with soft corals and such would not need as much flow.

I've got the next size up evolution (1050gph) and a small maxi-jet on a 60gallon that has some lps, shrooms and an anemone, and it seems to be enough to keep cyano at bay and keep the water turning over.

[acropoorer]

I agree with Cory. And who wouldn't, he knows how to hold a gun.:)

[ErikH]

I had 4 K4s in my 75 plus a mag5 as my return.

I would say 4 K4s and a mag 9.... the new k14s seem to be unidirectional and not such a wide flow pattern as a K4. Just my experience with both, never tried the 1400s in my 75, just in the 200.

[justahobby]

I agree with Cory that it depends on what you keep. Either way, I would add a couple small powerheads that you can stash behind rocks to stir up the dead spots where food settles.

[fjr_wertheimber]

Better yet, for the price, find some used Tunze Nanostreams and do the shroud mod to 'em... TONS of flow then, and a good, cheap price! :-)

[Big_Pun]

I ran my mixed tank, 65g(36"L) with 2 k evo 1400, mounted one kinda high and after tweaking there positions the flow was perfect. it not a 1400gph in one tight stream it's spread out. I just upgraded a few months ago to a vortech mp40 es, and it's gotta be one of my best investments in this tank, I talked a couple other people into one and they agree also

[ErikH]

I love my MP40s!