[GMGQ]

I have an algae problem in my frag tank too. I think one of the problems is that the water isn't cycled through the sumo as fast as the display tank.

For you, it's also because you have the 2 clown fish adding to the bioload.

I've started running HC GFO and carbon, and that seems to have at least halted the algae from spreading.

I have a cleaner shrimp in there too, as they are faster at grabbing excess food than hermits, and can climb better.