grow out tank

Pictures of my peacock bass growth over 5 months. Tell me what you think!

I have 2 delhezi bichirs at 4 inches. Do you think the 20 gallon is too small? I was told a 40 breeder would be better. The size of food they can eat is literally crumb size and I was thinking it would be hard for them to find them in a 40 breeder. I am trying to get a 40 for when they grow...

Is a 20 gallon going to be ok to grow out a black spotted eel (m. Dayi) for a while before I put it in my 120? It is around 5-6 inches right now.

My youngest clown loach who is in my 20 gallon grow out tank became very suddenly bloated. I read about eye issues look at pic please tell me if they look ok. The tank mates are 1 juvenile arowana (lost sac 2 weeks ago), 2 honey gourami 1/2", 1 sword tail Molly adult, 1 juvenile skunk botia, 1...