I guess I should mention it is a reef ready with two overflows so the equal drainage shouldn't be a major problem.
After the issues you have brought to light, I am pretty sure I won't even attempt the 20's.
I would really like to fit the largest
sump as possible(which can be brought down through the top of the stand after removing a brace or two) but I'm not sure what size aquarium would fit appropriately in the dimensions available.
Also in an effort to control costs I plan on basically building my own
sump from a standard tank(adding baffles and holes) but I'm not sure what standard size tanks would work out for my available space range. I do want to leave enough room to have my calcium reactor and hopefully some sort of top off system in the stand as well( which may not be possible). A four foot tank would leave me a little less than two by one and a half foot square area for these accessories.
