and Flying fox are different species. My SAEs are 6 inches now, and I don't believe they've finished growing. They HAVE however, stopped eating algae! Mine are in a SIX FOOT tank and they shoot from one end to the other in the blink of an eye.
Fix your algae problem without compromising the health and quality of life of the inhabitants by overcrowding.
Put black cardboard behind the tank
Put a cover over the top of the tank
Change water more often
Put real plants in
Get a uv
Decrease the amount of time you have the tank lot
I'm sure there are a dozen better, humane and responsible ways to fix your problem.