I just happen to have a brand new stand for free if you want it. It’s exactly the demensions you want. I upgraded to a metal stand and have no use for the stand that came with the tank. If you want it it’s yours
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I use a commercial 55w unit stainless steel which has giving me no issues what so ever. As long as it’s a quality moisture tight unit you should have no issues
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The black soot means that moisture got in and the unit was failing, but smooth skin deep water acros are a funny bunch. Either they make it or they dont
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What you would dose wouldn’t be enough to effect your alk imho. But potassium nitrate is fine too you can also use stump remover which has a lot of success just not that pure
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Dkh isn’t going to affect your fish it will affect coral hence why your cap is showing distress. It’s also your biggest Alk consumer
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