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post #1 of (permalink) Old 03-24-2018, 03:51 AM Thread Starter
Algae Grower
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Black spots on pool filter sand?

My tank (29gal bow front) has been set up for a while. It's planted fairly heavily I believe, I recently got some seachem root tabs and some s.repens. it's been about 2 weeks and I am starting to see some black spots on the sand above the root tabs. I just need to know if I need to be concerned about this? I have 11 neon tetras, 5 cherry shrimp. I also dose Nilocg "Thrive" 2 pumps twice a week. And half a capfull of florish excel twice a week.
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