Morning Everyone, So I have run into an issue with my tank. I ended up getting this off Craiglist and everything looked fine. It is a 180 gallon reef ready with a twist, the bottom panel is a PVC like material with a plywood backing (photographs to follow) I resealed the tank and built the stand myself (thank you King of DIY and youtube). So once I placed the tank on the stand I found that I had a problem. The tank edge of the tank does not come in contact fully with the stand. Now I have my 4 foot level and prior to placing the tank on the stand I checked to ensure the stand was flat and level, which it was. I checked the level of the tank and found that it was in fact not level because of contours in my flooring. So I shimmed the floor and got the tank on the stand level. Problem though is that the tank's edge still does not meet the stand top all the way around the stand. The rear two edges are fine, they sit flush next to the base. The front two on the other hand do not and instead lift up at the edges. The center of the tank though is flush though. I attempted to solve this issue with shimming the bottom of the stand further but every time I shimmed one side the other would get worse and vise versa. I also added a 3/4" piece of dense insulation grade styrofoam which was recommended as well by the previous owner. This all has left me scratching my head for the last couple months and without water in my tank. I will include pictures and look forward to any possible suggestions or comments that ya'll can make based off these details. After all of that explanation I just am looking for a way to fix my current issue. I have seen and heard numerous ideas to include filling the tank to see if the weight will compress any warping that may have occurred in the plywood base of the tank. Also I have had suggestions of either planing the stand or the plywood itself. Also rebuilding the stand or tank are also ideas that Ive heard. I'm interested though in what ya'll have to say about it and look forward to seeing any suggestions. Thanks again everyone. Also bonus question: what type of wood would you recommend finishing the stand in? (Cedar, Oak, Pine, Poplar, ect?) I am thinking of a darker stain/look to match other future furniture in the room fyi.