I checked it out, and I think that it was just the hole underneath the overflow, I did a test with paper towel to see if a leak was in the silicone, and nothing significant showed up. The only thing Ive noticed is that the back chambers are starting to get a film on the top of the water, nothing in there but foam and polyfibre and purigen for first round cycleing, so far sg is 1.025 haha not testing yet since its all base rock and old cured live rock
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