Just because the fish can grow too the length of the glass doesn't mean they'll be comfy. They need room to move. How bout I give you a pool that's the same length as you and tell you to live in it? Only bichir that would work in a standard 60g (3ft)would be sengal. Which is the smallest. Your tank is only 2ft its no good for big fish. Sorry to say but its only good for small community fish for life. Tetras rams neons. Spiney eels. Cory cats
Edit read you have a 90g then you could do a sengal but should move it after a it grows.
I need to spark up my fish life
do you have a lid? If no then they all will jump. Its not a matter if they will its when they are extreme escape artists. Nothing you can really do now maybe add aquarium salt.