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**lauraleellbp** · 03-30-2008, 08:20 PM

I've kept a few cardinals with a betta in a 5.5gal before, didn't have any problems, just changed 10% of the water weekly and everything was good for several years (was a tank at work so I took it down after I quit that job and we moved).

I'd say the 5gal sounds rather full ATM though; you could add the betta but will probably need to change more like 50% a week (2x 25% weekly would be better) b/c that would definitely be a high bioload. What kind of filter do you have on there?

I wouldn't be surprised if the molly does decide to take nips out of the betta's fins in the other tank, though.

03-30-2008, 08:20 PM	#2 (permalink)
lauraleellbp Fresh Fish Freak (View User Tanks) PTrader: (28) Join Date: Feb 2008 Location: Naples, Florida Posts: 8,125	I've kept a few cardinals with a betta in a 5.5gal before, didn't have any problems, just changed 10% of the water weekly and everything was good for several years (was a tank at work so I took it down after I quit that job and we moved). I'd say the 5gal sounds rather full ATM though; you could add the betta but will probably need to change more like 50% a week (2x 25% weekly would be better) b/c that would definitely be a high bioload. What kind of filter do you have on there? I wouldn't be surprised if the molly does decide to take nips out of the betta's fins in the other tank, though. __________________ Laura Lee; 29gal, 46gal,and 90gal FW planted in progress- see my journal at http://forums.tfhmagazine.com/viewto...p?f=82&t=23207