I did use it inside the tank......I never say any "flakes" coming off. All I saw over a period of months was the white of the PVC. I think, and only a guess, that snails or crabs were picking off "stuff" that was on the paint and the paint was coming off with it. However, I never say any issues with the tank (SPS, LPS, and fish).
When I set up my 300g I did not go the route of painting the PCV. I went with Loc-line instead. Only because of the issue of the "black" painted PVC not lasting.
Jim Mc
Jim Mc
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