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Drained tank to clean and leave empty since going away for 3-4 weeks. Plan on leaving empty so no worries about audden leak from hose or FX5. While cleaning the tank I noticed along the bottom sealant there look like air bubbles have formed in many places. Is this common and I just not use to seeing the tank empty or am i in for a leaking tank soon?

Please help soonest. Cant upload pics yet but will try to get them here.

You can email them to me, I'll have a look. As long as the sealant is not lifting up at the edges, it should be fine. How old is the tank?