<a href=showthread.php?s=&postid=11763274#post11763274 target=_blank>Originally posted</a> by Untamed12
Whatever you do...don't remove that fern caulerpa. (weed it carefully) It is using up nutrients in your system. If you remove it, something else will surely grow (like hair algae).
My tank looked like that for a while, then I added a Naso Tang who ate all the caulerpa. Within a few weeks, I had major algae problems!
You have a beautifully balanced looking system there.
I wish I could give you the magic answer to keeping the sponges thriving....