White webbing-like substance in tank

[BCTugboat]

Thats the thing, its been set up with live rock since day 2 or 3 for over a month. I "ghost fed" tropical flake until my brittle came in. He ate the flake so I kept feeding it til recently. It should by all means be fully cycled by now. I found the brittle star earlier and he's alive and well. I'm a little lost, but I've done a 20% water change and I'll test the water in the morning. The ammonia level didnt seem to have budged since yesterday, still at 0.25 ish.

Upon researching featherdusters some more, i found that when they sort of panic (like when placed in a new tank and handled by human hands) they sometimes release all of their sperm into the water as a sort of last ditch effort to spread their genes if they die. I think it may have been that, though it does look a little different.

Still probably thinking bacteria though.