Welcome to the forum, but just remember: whatever you do, fish will die, but as aquarists we try our best to keep losses to a minimum and half the time it's not even our fault.
I’ve had a colony for about 2 months and they’ve all reached adult size, water parameters are fine; I was wondering if anyone had some tips about how to stimulate them into breeding.
Congratulations!( I think mine are on their 6-7th generation now) just make sure to get some new individuals over time so your future fry don't have any deformities.
A banana plant would probably get pushed into a corner, but could root there and start spreading.
Have you considered moving the Black Tandan, or giving him away?