How to remove plaque?

John3187

Dear forum members, please tell me what this black coating is! The stain is slowly but surely increasing! How can I get rid of it?

Melinda

Ask the sailors, they will help.

Stephen

Dear, your response is not quite clear to me! Did I write to the wrong place?

Adrienne

it's very hard to see!

Charles5941

A stain in the form of black coating. There is already an unsuccessful experience in dealing with the same stain. A rock with zoanthids was affected. Cleaning with a brush did not yield the desired results, and the coating kept reappearing. As a result, the zoanthids died. The rock was removed from the aquarium. And here we are again in the same situation! What to do?

Sheila

Everything I could pull from my camera.

Bridget

It kind of resembles a sponge... is it soft when you touch it?

Scott9892

It is soft and "dusty."

Chad231

I also have a few of those sponges. I never even thought about getting rid of them. What are they dangerous for?

Kenneth2761

I have a lot of them in my tank too, and not just black ones; there are pink and yellow ones as well. They seem to be filters. If I remember correctly, the sponges grow actively when silicates are present in the water.

Natalie

Does it dust when touched? If so, then it's not a sponge.

Troy8808

It is indeed dusty!

Jeremy8404

If it is very tight, scrape it off and siphon the water into a separate container using a tube (usually done during water changes).