A carpenter made me a platform for my 180g aquarium. Unfortunately my wood floors have a lot of sag and one corner is nearly a half inch off the ground with other unevenness throughout. Im looking into larger carpet shims or leveling feet. The carpenter proposed feet like these pictured but I’m concerned that they are a risk as they’d be mounted inside with the contact point to the ground not directly underneath the 2x4s. Also, it would be extremely difficult to adjust the ones in the back with a wrench once we have it in place against the wall. There’s finger screw footmaster leveling feet I’m looking at, but their mounting plates wouldn’t work with the 2x4s as we have now - could we double up and add another set of 2x4s so we’d be working with essentially a 4x4 frame? I’m wondering what you would recommend in this situation? Any suggestions would be welcome. This is all for my beloved, currently 10” turtle I got from Chinatown when she was the size of a quarter. Most expensive $3 I’ve ever spent. Wouldn’t change anything except for my initial stand/platform blueprints. Weight wise, I will only have it filled half way at most (and then eventually move somewhere with concrete floors so I can use a traditional stand and fill it to capacity).