Is Superfish Home 25 Aquarium Too Small?

Hi all, it's been a while. I've been getting on pretty much OK (I'll post a separate algae problem post) and everyone is getting on OK.

You might remember I was down to 2 female pear gourami's, big girl still bullies little girl but they seem to get on much better. So to my question.....

I was going to try and get a few more girls and a male, but given last time I had a string of causalities I'm not putting any more fish in the tank without them being in quarantine first. But I've only got a 25 litre 47 x 25 x 28.5 cm, that had been used previously as a hospital tank.

I know it's too wee for gourami permanently but is it still too wee if just used for quarantine? If OK could I put 3 gourami in there or is that really pushing it? Or would one at a time be better?

If I need to get a bigger tank for this purpose what would be the best size and how long should I keep them in there, 4 weeks?

Thanks

Thanks Sue, I'll check around some LFS have wee ones, and some have much bigger where the males are obvious. There is always the excuse to buy another tank!