Originally Posted by JuliansMomma
Like literally was told it was suitable for one goldfish. My parents have guppies and no Bettas, I'm contemplating giving her to them for their tank (we live in the same house but this still makes me a little sad!)
Hah, if the petshop was telling the truth and it was *actually* suitable for one goldfish, it would be a good 100+ litres.
I think it would be good for your little guppy girl to go and live with other guppies. :) They are social fish.
This being said, I and some of my friends have all kept guppies and bettas together successfully. It depends on your fish and on your tank - the fish need room and hiding spots to get away from each other. Obviously, it wouldn't work with an aggressive betta, but some bettas tolerate them just fine.
As for Endlers, Olympia, I really wouldn't worry. The males are so small and their tails are not nearly so long as a guppy tail. If your betta will tolerate something like tetras, he should tolerate an Endler.