From whatever research I've been able to do today there are species that range from 4 - 8 inches that are suitable for an aquarium. However, I did see a recommended minimum tank size of 30G for 2 of the 8" species (I think they were African's - I guess senior moments are contagious because I'm catching them from the retiree's in Florida LOL - it CAN"T be MY mind that's going !! LOL).
I'm still researching since I'm now toying with the idea of doing this in one of the 20 longs I have .... the other thing I can't figure out is where to buy them ! LOL
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35G barebottom: 2 boesemani rainbowfish, 4 congo tetras, Low light plants (1.5wpg) attached to or planted in my own handmade ceramics - Anubia v Nana, Anubia v Barteri, Red Rubin Sword
2.5G - Spot (beautiful betta - Soft pink with red spots on his fins. Java Moss.
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