Would this be too much?

[Primetime]

I was wondering if adding 15 Harlequins at a time would be too many fish and cause a bacteria bloom? They are on sale at 3/1.99 and I wanted to take advantage. Eventually, 7 would go in the 20 gallon, and 8 in the 55.

 

[fishpoor]

That's quite a jump, but if you do water changes more frequently, it'll work.

 

[Roan Art]

No QT tank? *scolds*

Depends on your biological filteration and how "mature" the tanks in question are. Mature meaning that the biofilter has been established for quite some time and is able to adjust to a large change in load.

I put 24 juvenile rainbowfish in my 36g (serving as a QT at the time) and didn't get a burp, however the tank has a Penguin 330 and is a mature tank.

Roan

 

[Primetime]

No QT tank? *scolds*

Depends on your biological filteration and how "mature" the tanks in question are. Mature meaning that the biofilter has been established for quite some time and is able to adjust to a large change in load.

I put 24 juvenile rainbowfish in my 36g (serving as a QT at the time) and didn't get a burp, however the tank has a Penguin 330 and is a mature tank.

Roan

Nah I'm undecided on quarantining them..I'll probably lose some because they like established tanks.. Also, I just thought of something. Would the Balas eat them?? I know they can eat Neons, but they can't eat Cardinals, could they eat Harlequins? They have very tiny mouths btw.