What is this stuff? Is it good? Bad?

[Hambonej]

I have a biocube 29, the sump is pretty basic. Chamber 1 hydor slim skim. Opened up the flow into chamber to filter floss, purigen, chemi pure elite, then rock rumble. Chamber three 3 heater and return pump. Two power heads in the back for extra flow in the tank. I have mars-aqua lights on a timer. 6-8am blue 80%, 8-10 blues 80% and whites 20%, 10a-6p whites 20%, 6p-8p blues 80% and whites 20%, then 8-10p Blues80% I have also gutted the factory lid and just set the lights right on top. The tank have been running for about 8 months.

 

[Daniel@R2R Verified Admin]

I don't target feed anything...I just broadcast and let them grab. Corals are primarily photosynthetic creatures anyway.