what is this? pic

[alliedag85]

well i had this on my live rock about 2 months and most of its gone. i would say i have 10% on two rocks. just wondering if n e one can tell what it called or how i got it. ive been using DI water changes seems to be wking. any info would be great. thanks this pic was taken two months ago.

[dmweise]

Looks like dying coralline algae. I had that on mine too. I get that on my equipment that has coralline on it when I remove it from the tank.

[alliedag85]

dont know y it would be dying. everything seems to be going fine now. i started using bionic when i started the di water changes b4 i was using tap water with prime. thanks been up since nov 5 08.

[ErikH]

What is your CA and Alk? What lighting do you have?

[alliedag85]

cal 350 alk 9 i was using i 65 wat 50/50 pc now i have 3 65 wats pc two of them 420 & 460 actinic and the other 1ok daylights

[ErikH]

yeah the drop in CA probably caused the problem. Keep your parameters in line and it will come back.

[alliedag85]

im thing thats what did it cause i added the lr i month after setting up. about a month ago i started using bonic. what do you think i should use figi gold or just stay with bonic. do you think my parameters are good? im new to this. i hope i can get my coralline algae back.

[dmweise]

I think it goes through cycles. During the summer I have more coralline. During the winter it dies off to were I do not have much. My water is perfect 99% of the time too.