[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

A bit concerned about this..
In the area my diffuser sets in, in about 3.5' of water-runs midnight for 15 min and noon for 15 min, there is a grey foamy area around the 6' diameter hole that stays open. My lead biologist says the only time he has seen craws come up on top of ice was with serious bad water quality issues..
Anyone have any ideas or thoughts on that?

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