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hello all I'm about a year into the hobby and have learned things but not all. I'm having trouble with a lot of algae growth. I try not to over feed but I want to make sure my dragonette , clowns and four chromis live. I've got an additional power head on my 29 gallon biocube but the flow...

What are these little whit things they are in the back of my biocube. They are next to the pump and in the chamber next to my filter media?!????