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#1
01-15-2017, 07:10 AM
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That happens when the piece of acrylic is either too large and expands in the tank, but its edges are pushing against the glass so it buckles in the middle OR the material just warps lol.
Nothing you can do about it. I'd say pull it out, make new teeth that mount higher up and just use tint on the back of the tank (outside). It will be much easier to keep clear of coralline algae. 
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#2
01-16-2017, 12:43 AM
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Plus one to comment above!
adding a weir and tinting is your best option. A weird story but true... a friend had a piece of acrylic that was silicones to the back wall, they probably skimped when siliconing the back acrylic and as a result it started bowing the water that was trapped in the back between the glass and acrylic overflow went stale because of no air and water movement. Needless to say he lost corals and I think a few fish. It's a simple thing that is overlooked but I'd either remove the acrylic and flatten it out using a heat gun to bend it back flat and cut abit off the side so it fits better or just paint/tint and install teeth.
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Always looking for the next best coral... 90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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