About 2 months ago, I went through the diatoms and then some pink algae showed up. I killed the lights for a month,all but 2 hrs every other day to feed. Now, started turning the lights on about 8hrs a day and the diatoms showed back up, then they died off and the pink algae showed up. I dug some out of the sand and the sand it was in was clumped together. I'm assuming it is cyano
. Which puzzles me because I have a 75g sump with a skimmer, 50lbs of rock. the sump overflows into 2 30x18x10 wet/dry filters I am using for fuges(have them filled with chaeto.)
The params are 0 amm, 0 nitrite, 10 nitrate, 0 phosphate, 9dkh, 450calc.
I use only ro
water and IO salt mix. I test the top off and pwc
water everytime and they show zero's across the board.
The tank is 180g and I have been doing 40g water changes every week for the past month.
I don't get what is going on, I thought I had adequate filtration and the 3 hydor 750gph powerheads plus the 1500 gph
water pump in the last fuge would make for great water circulation.
What else could cause this. Btw the lighting is t5ho 6x54w bulbs less than 2 months old.