http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=how-much-in-an-aqurium-is-enough-#1 Hi, I have currently in my 30 litre fish tank a range of 3 guppies plus a bristlenose catfish which is around 1.5 years old. They are getting along well. but i started off with 6 guppies and in the first few weeks 3 of them died. I wanted to try to breed. i Have 3 male guppies. If i buy some female guppies will my aquarium be too crowded. Judging by what i see now there is heaps of space. Also what is the ratio of female guppies to male guppies that should be in the aquarium and how do i know what a female guppy looks like? Kronaldo28 2011-04-20 http://forum.aqua-fish.net/?topic=how-much-in-an-aqurium-is-enough-#2 A 30 liter tank is a good place for maximally 20 Guppies in case you have a good filter. Inbreeding will occur under such circumstances though, so I'd solve the question "What to do with the babies" firstly. 1 male : 3 females is a good ratio. Female is bigger than male, also is less coloured and her fins aren't that beautiful. jan 2011-10-19 http://forum.aqua-fish.net/?topic=how-much-in-an-aqurium-is-enough-#3 spam removed. last modification by jan xinggu 2014-03-07