MNCarpenter Posted December 19, 2018 Report Share Posted December 19, 2018 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? Quote Link to comment Share on other sites More sharing options...
wyzazz Posted December 19, 2018 Report Share Posted December 19, 2018 I use 30 PPI foam, 20 PPI will allow shrimplets through. I don't typically clean behind mine but once every 3-4 months. Quote Link to comment Share on other sites More sharing options...
MNCarpenter Posted December 20, 2018 Author Report Share Posted December 20, 2018 Is there quite a bit of build up when you do clean behind them? Sent from my SM-N960U using Tapatalk Quote Link to comment Share on other sites More sharing options...
wyzazz Posted December 20, 2018 Report Share Posted December 20, 2018 Some tanks more than others, but it's not too bad. Quote Link to comment Share on other sites More sharing options...
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