To level an aquarium it is best to level the furniture or stand the aquarium is sitting on not the aquarium itself.
Diy aquarium stand not level.
You will have the level of water running next to the edges and revealing any lack of level which is not good for stability and distribution of weight.
Large fish tank stand with canopy.
The idea is to have the stand evenly support the aquarium so it does not apply upward pressure on some parts of the tank while leaving others unsupported.
Not all floors are perfectly level and aquariums don t need to be perfect.
If the stand is level but the tank is not sitting on it properly then an aquarium leveling mat or sheet of styrofoam may be used to smooth out the irregularities.
When you put the empty stand on the floor it should not rock or move.
Use shims under the stand when needed.
Aquarium level but not touching stand new to the hobby.
125 gallon aquarium stand.
This wonder in wood can support a massive 125 gallon aquarium with ease.
How to build aquarium stand for a 4 feet aquarium building an aquarium stand is very easy and it does not demand any high level of wood craftsmanship.
Here is a google images search on aquarium stand diy to use as a starting point for looking at how folks have.