The stand is almost perfectly level on the top where the tank would sit. I am off just a bit on the right rear side of the stand if you were facing the aquarium. I am using a smaller level when I look at it so I think tonight when I get home from work I will get my long level out and check again. I just want to be sure that when I start filling it up I have wiggle room if something starts to give a little. It is a solid stand made of 2x4 and 2x6. It is glued and screwed together and weighs a ton all by itself. The floor is more what I am worried about. It is that wood with plastic on the bottom set overtop cement floor. The cement is not very level making the wood floor not level as well. Just trying to be overly cautious as I do not want 240 gallons of water in the floor.How much out of level are we talking about? If I read your post correctly, you built a stand not level to sit on a not level area of floor. Why not just built the stand level and shim the stand? The tile floor where my tank is isn't perfectly level either. Probably 1/8-1/4 over 6' I always just shim the stand with no problems going on 7 years.
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