75 is way to small. Depending if that jags male or not it's gonna get big.There shouldnt be any problems what so ever in a 125 with that stock, you could probably get away with that stock in a 75 or 90
where in sask. r u maybe u have something to tradeI have a lil' guy that looks just like that and about the same size. I also have a female about 10" that is less than 2 years old. She grew fairly quick compared to most of my other cichlids all the way through but like said in the previous post she had a big growth spurt at about 4" to 7" then barely grew for a couple months and then had another spurt. She isn't really getting much longer but lately she's been getting a lot wider and beefier. Really nice color pattern too, almost like digital camo.
I wonder how much bigger she'll get? Every source says something else when you try to find the max growth rate of any of these fish so I think the best way to know forsure is experience or the experience of others. I fully trust no sources for 100% accurate species profiles. Always a margin for error based on that no two individual fish even in the same species will be exactly the same.