I have a 90 gallon reef setup with 2X175 watt 10,000 Mh
lighting and I am still recovering from a huge green hair algae outbreak in August.
I associated it with unrecovered dead fish, ich,
and a phosphate problem (bad RO
membrane). I have removed the phosphate using a phosphate sponge to bring the levels down to 0 to .03
and I have performed many 10 gallon water changes. In addition I reduced the light cycle down to where most of the algae cleared up after some scrubbing.
Now I am trying to bring the light cycle back to around 12 hours, but I can't get there without the algae threatening to take over again. I purchased a few more snails, but I still only have about 4 or 5 of the large Mexican Turbo Snails and 4 or 5 of the smaller Astrea snails. I also have a few assorted hermit crabs. I am currently at about 6 hours and the snails seem to be able to just keep up.
My question is 'does this seem normal'? Is the answer that I just need to purchase more algae eaters, i.e. snails?
Thanks in advance for any advice you can give.