Could I Add More Fish

[mackay55]

hi I have a jewel Rio 400 tank and fluval 305 and a fluval u4 filters.
 
I have 12 red eye tetra
 
1 BN pleco
 
2 firemouths both male  
 
I would like to know if I could add another school of tetra.
 
 
any other suggestions are welcome

 

[attibones]

Which fish go in which tank? You've given two tank sizes but one list...

 

[eaglesaquarium]

1 Tank - 2 filters 

 

[attibones]

Ah, I see now. Was under the impression that the fluval 305 was another tank. I'm not too familiar with fluval products, aside from the Edge and Chi tanks.
 
Regardless, this is a pretty nice sized tank. I'm not too sure what the rated lph for the filters would be, but I would think you have space. I don't know much about firemouths either, but what research I've found says that they are potentially aggressive. Provided you have plenty of hiding spaces, I'd say that you may be able to add a second school of tetras, depending on the type. How to the firemouths get on with each other? I'd think that because you have two males things may get complicated. If they are alright with your tetras, though, I don't see why you couldn't get some more of that species, or something like emperor tetras perhaps.