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MNCarpenter

Cleaning behind hmf's and foam thickness

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So when siphoning behind your hmf's is there always a ton of crud on the bottom?  I have it in all of my tanks with hmf's.  But its worst in my tank with 20ppi foam.  I also noticed last night I got about 15 shrimp in my.dirty water container from behind that hmf.  It's over sized both width and height so idk are shrimp really able to navigate through 2" of 20ppi poret foam?  Also has anyone tried 1" 30ppi foam in a 5.5 gallon tank for a standard hmf? Corrner hmf? 

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Is there quite a bit of build up when you do clean behind them?

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