I am not sure what to do with my tank. Everything is healthy including unfortunately the photosynthetic sponge that is taking over everything. Nothing eats it.
I am afraid to change water because those new nutrients makes it grow faster but the lack of nutrients the tank has now due to the sponge removing everything from the water is having a negative effect on the corals which are all soft.
I trim it when it covers gorgonians and other corals but it exudes toxins when I do that.
I added "Phosguard" to remove silicates but that didn't seem to have much effect so I am still experimenting. This is a hard problem to correct and this will be my last tank so I don't want to remove everything and soak the rock in fresh water to try to kill the stuff. I am not even sure if that would work.
But this is an interesting situation that will keep me thinking for a long time. :)