Originally Posted by Gormond:
“So in a 45 lItre tank you can only keep one fish?”
Depends on the fish. You couldn't keep a goldfish in there at all.
But, you could keep a few guppies if heated. Or a solo Betta. A few white cloud mountain minnows if cold. WCMM are brill - especially if they have room to schoal.
If you can, get a bigger tank - 100lt would really be the smallest for a community tank - get a heater, themometer and a good filter. Then you could go for a few guppies, maybe a few platties and a couple of loaches or Cory. The only trouble there would be Cory's need a salt free tank, guppies and platies like a bit of salt.
Try ebay or freecycle for the tank.
Its a great hobby and great that you are doing your research first. Bit addictive though - you'll end up buying a bigger tank anyway so might as well buy it now