I would shoot for the 56 column or bigger. I saw your other post and that your limited on space compared to an equivalent 55 gallon your better off again...
Column 30x18x24=56 gallons 540 cubic inches floor space
Standard 48x12x22=55 gallons 576 cubic inches floor space
than minus 6 inches height for basking
Column 30x18x18=42 gallons
Standard 48x12x16=40 gallons
You sacrifice a little floor space for more swimming area, which is what you want as long as it doesn't make the turtle cramped. the most swimming area without squeezing them in.
With my column tank i just put barriers at the top around the basking area in the corner and fill it right to the very top giving them the full 70 gallons...
I tried but couldn't do the same simple fix with my standard long tanks because of the cross bars in the middle still gave them a place to escape from. Although you can rig up an out of tank basking area or border the entire top in on them as many have here before.
This is a cheap way to give your friend a larger home.


