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Hi all,
I've recently noticed that there has been a build up of some weird red/brown stuff on my filter and anubias plant can anyone tell me what it is and if it is harmful? here are some pictures


 

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That's probably just diatomaceous algae. It's nothing to worry about. It is very natural to have in an aquarium. I use a clean, never used toothbrush to get it off the walls of my tank. You can also use the toothbrush (if it has soft bristles) to clean off the anubias' leaves. Be very gentle though!
Snails will also eat it which is nice!!
 
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