The Planted Tank Forum - View Single Post - Black spots on pool filter sand?
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post #5 of (permalink) Old 03-24-2018, 08:14 PM Thread Starter
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Quote:
Originally Posted by Waltoflorius View Post
Hydrogen sulfide perhaps?
I Don't Have Enough experience to know for sure. But with what I've read that usually comes with a smell, which I have absolutely no smell or ill effects so far. Just the black spots as of right now, I vac them and their gone for a few days. I do vacs and 30% water changes twice a week and all my parameters seem to be fine ( I use api master kit) but do not check for kh or gh so I'm not sure about that. But I am still REALLY green to all this.

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