My tank is 5 ft, and when put in, it was 100% level... Once I put water in, it was out by a bit (Not much, but you can see it)... Anyways it has been almost 3 years and no problems. In my case I do believe the styro layer compressed unevenly, but not sure.
I wouldn't worry about it. I think trying to fix the slight uneveness may cause more issues, like even cracking the tank! In my case I am ok with it. I have a level with the tank and check it occasionally and it hasn't changed ever since first filling it up.
As with others, mine is euro-braced running wavemakers.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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