So I've been battling this algae/diatoms now for a while and haven't seen much progress until recently:
It looks "bad" still but the plugs were completely covered and I thought I lost close to 20 Zoas. I changed my rw-8 wave makers to wave mode ( they were on random ) and next day saw polyps peeking thru the algae and some regression of the black stuff.
Here's another pic of the other side of the tank:
I'm using rodi water, keeping up with weekly water changes, feeding sparingly every day (small amount of fish food or mysis shrimp) and they eat it all, change filter socks every three days, etc.
I have seen a large bloom of calerp in my refuge:
(I haven't gotten the filter sock changed today yet but will.
Any suggestions on what I'm missing? I have lost 8 small colonies of Zoas now (including my red and blue hornets...boo!) but everything else seems to be stabilizing. I'm thinking of getting rid of the frag rack as this seems to be the home of the algae. I clean off the frags weekly and it's back to what the pic looks like almost overnight.
Light cycle is 4-10 for my t5 420 blue and 5-9 for my 400 watt XM 10k halide. Thinking of upgrading to a 2x250 watt halide system in the next 6 months as well.
Thoughts?