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Crack between bulkheads on bottom of tank??
If that crack ever gets bigger or makes it to the silicone seam, have a emergency plan. On the frag, when the skin is gone and the skeleton is turning green with algae, toss it. A rubbermaid tub will serve its purpose as a temporary tank, just top down pics only on that.
You'll be bringing a tape measure for sure when you go new house shopping in the future. Good score on those frags and the prices you paid. Try determine if it is actually a crack, or a scratch that now has algae growing in it. A scratch will grow algae easily in it. A crack will usually stay tight together until the day of failure and show the prism break of the rainbow light makes passing through the glass without growing algae. If the overflow box is perfectly sealed on the bottom and sides, you can pump it out, take the bulkhead off and inspect it well. Don't do that though unless you have a tub and a plan.

Sorry I'm not home right now, on vacation. Will take pics when I get home Monday night right away for you... But mine looks the same and worried me too. I believe it was silicone?on the top side just a thin string the thickness of a hair to look like a crack. Hopefully yours is the same.
I had that gut punched feeling for a day or two until I messed with it to find out. There's another spot in my tank with an extra thin piece of excess silicone too so I had something to compare against. On my tank I could clearly feel the rubbery texture of the silicone. Then I stopped worrying. I was mainly worried because I bought my tank a year ago and sat in garage the whole time so I couldn't ask Steve at SCA to replace it now after all that time.
That's awesome glad to hear it. Glad I could help. BTW tank and corals look fantastic.
I have a local frag swap to attend next weekend and already pre ordered some corals! Getting a Glittering Gold acro, MC Purple mille, nuclear green Nepthea and aqua green Nepthea. Can't wait!

