Bonsai flowerhorn tank size.

[Deadeye]

I’ve owned a rainbow cichlid before but passed from ich in its gills. Wasn’t very colorful but had good personality

They color up very nicely over time.
My female not cooperating in breeding dress:

Not mine:

 

[Magnus_Bane]

My 40 is a standard 12” wide. And my 55 is also 12” maybe a couple more inches but still I think it’s stupid that it’s this thin

Just got to remember there's a difference with a reg 40g and a breeder 40g. They both contain about the same amount of water but will have different dimensions.

 

[Deadeye]

Just got to remember there's a difference with a reg 40g and a breeder 40g. They both contain about the same amount of water but will have different dimensions.

Yep.
40b is 36x18x15, while 40 is 36x12x21. 40 is good for smaller fish that like a tall tank, while the 40b is what you shoot for with the larger, less active fish like cichlids and red wolf.