So I just checked out your 125 (not sure how I missed it before) it looks great, as for the white fungus like you said no big deal, I do like how you kept your foam down quite a simple method compared to what I did with my tank although I was hoping to keep the weight down so I guess lead weights would have negated that (I did consider hollowing out the foam rocks and adding bricks into them) it is amazing how well foam floats, lol.
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ummm......i had to silicone the foam down too. and the left side STILL lifted. i tried one repair and it didn't hold. i'm actually considering re-doing the tank in the summer. that stupid great stuff is ridiculously buoyant. i'm thinking abut carving a kayak out of the stuff.....lol