you could do it w/ the right filtration, weekly 60-90% WCs and as long as there's nothing else in the tank. Question is, what are you gona do w/ the babies? TBH, I larger tank would be more suitable, but I will answer "Yes", I have no doubt that a 75g with a large amount of caves, hides-spaces and proper maintenance could house 1M; 3F GTs. They would LIKE a bigger tank, but if you wanna push you luck, there's a very good chance they will be ok.......but you MUST have 2-3 hide-spaces per fish....River rock can be boiled and built into caves with some time and patience. Think of it as putting together a puzzle....just collect a few hundred lbs. of rocks, sterilize them and figure out which piece fit best and where -Makes sense. I tried a threesome with convicts and the females fought worse than normal. I might stick with a pair. 1 male and 3 females is a crowd in a 75 gallon?
For example, this was a growout of mine - a 55g. growout. I would be chastised for this by most keepers, but the problems didn't even START until I started UNCROWDING them and taking fish OUT to move them to more comfortable conditions. The the hierarchy was disrupted and things went downhill (but I fixed it)








