What to put under your tank?

[Frogger]

I put a floor jack in my basement right in the middle of my 90 gallon tank.

My stair case restricted the floor joists from extending wall to wall and I felt I needed to add a little more support.

My floor was out of level in my living room so I protected my hard wood floor with a layer of vinyl shelf paper and then poured a thin layer of self leveling concrete on top of the vinyl on the wood floor. I created a dam using 1x2s with tiny nails into the hard wood floor. I removed the wood once the concrete was dry. I painted the concrete the same colour (if black is a colour) as my cabinet so you do not even see it.