i have a standard 125. 6' x 18". right now i have 2 oscars ~5", 1 JD ~5", and a breeding pair of convicts, male ~4", female ~3". i would love to add a GT or jag or both. too much? the tank has 3 big swords bunched together very densely on one side covering about a third of the tank, with the rest pretty much open, save some driftwood, smaller plants and rocks.