what's your end goal with the flowerhorn? 10+ years? or trade the fish in a few years, hence the reason for tankmates? is rehoming fish easy in your area?I’m new to this all. You were here once too. We learn from mistakes and build up knowledge to then give to the next generation of fish keepers. No matter who you are you gotta start at the bottom and build up
It's easy enough to find why many folks are saying a 75g is only good for 1x 10" plus aggressive fish. If you really want more fish, then get a longer 5-8foot tank.