I probably won't put any in with my bettas, as I like them just the way they are, but I'm just curious- can glass catfish live with bettas? 10 gallons? 20 gallons? They are such cute little guys.
Edit- Yay! Senior member :D Haha, okay, I'm good. XD
There are reportedly two varieties of Glass cats.
Kryptopterus Minor averages 2.5 inches while Kryptopterus bichirris can reach 6.5 inches which would require a minimum 55 gal.
They are extremely sensitive fish with respect to water quality and medications ,ESPECIALLY salt. They also do poorly in stagnant water (no movement), as do most catfish.
Ideal tank would be mature tank of three months or longer, with healthy biological filter and thirty gal minimum for the smaller variety with moderate current.
Few of these fish last very long if kept otherwise.
The most important medication in your fish medicine cabinet is.. Clean water.
I currently have 2 glass catfish in a 10 gallon with my betta (originally I only had 1 because the place where I bought them failed to inform me that they do better in groups). I have had the glass catfish in the 10 gallon for 6 months now and they seem happy and healthy. They were very skittish at first but now come out at feeding time =)