Firstly welcome to another uk mfk'r. Great to see another disciple.
Would hate to scare you off here by just adding to some of the flames but there are a few points that should be made. Firstly your tank measurements are wrong. Rena only make tanks 20" wide. Their tank are shown in cm and yours is 150cm x 50cm wide x 60cm x high or roughly 60"x20"x24".
Secondly as many say your mbu is stunted. I know because I made the same mistake. Kept a mbu in the biggest Rena tank that is the same width and height as yours but 2' long so 25% more water than you. Like yours it got to about 12" and stopped growing (I suspect yours is also smaller than 18" as you are probably judging it's size by it's width across the tank which you believe to be 24" so my guess is that it's actually about 14"). It always seemed happy dancing up and down the tank and as they are not big adventurers I didn't see that it needed a big tank. Until one day I came home to find it on the top of the tank inflated and then it died. And believe me if you've kept a mbu for a number of years like you have, losing a mbu is really, really hard to take. They become family.
I wouldn't want you to go through that so I would suggest selling up is best for the fish or finding a tank at least 30" wide.
Would hate to scare you off here by just adding to some of the flames but there are a few points that should be made. Firstly your tank measurements are wrong. Rena only make tanks 20" wide. Their tank are shown in cm and yours is 150cm x 50cm wide x 60cm x high or roughly 60"x20"x24".
Secondly as many say your mbu is stunted. I know because I made the same mistake. Kept a mbu in the biggest Rena tank that is the same width and height as yours but 2' long so 25% more water than you. Like yours it got to about 12" and stopped growing (I suspect yours is also smaller than 18" as you are probably judging it's size by it's width across the tank which you believe to be 24" so my guess is that it's actually about 14"). It always seemed happy dancing up and down the tank and as they are not big adventurers I didn't see that it needed a big tank. Until one day I came home to find it on the top of the tank inflated and then it died. And believe me if you've kept a mbu for a number of years like you have, losing a mbu is really, really hard to take. They become family.
I wouldn't want you to go through that so I would suggest selling up is best for the fish or finding a tank at least 30" wide.

