I currently have 1 senegal and 1 delhezi in a 10 gallon. I am receiving 2 Endlicheri this friday, both will be placed into the 10 gallon. All 4 fish are between 2 and 3 inches long. How long (in inches) should I let the bichirs get before moving them into my 20 long? How long before I move them into my 40 breeder? When they grow out of the breeder I will have a larger tank set up for them, I'm thinking a 75 gallon.