Too big and not a nice color

Pro: I like the fact it doesn't hang on the back. Cons: It is larger than I expected and doesn't come in any other colors other than blue, which doesn't fit my decor. I can't get it open to clean it. I have tried and tried. I'm going to have to pry it open which I suspect will damage it. I don't notice any decrease in sediment. The only reason I keep it in my tank at all is for the healthy bacteria colonies.

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