Oh no! please don't put male and females betta together! Certainly I've seen it work under the rarest of circumstances, but it is such a delicate balance and many cases end up with either the females or the male dead. :( Its really not worth the heart break >.<
Im a betta nerd, so if you would like to hear more details about the whys and why nots about bettas please do not hesitate to ask!
I'm a teensy bit concerned about whether your tank is cycled yet~ ammonia, nitrite and nitrate build up from a fish's own waste products can easily kill fish :(
A cycle generally takes a month or more. There are products out there that can help speed up the nitrogen cycle. If you PM user Hallyx about it, he can tell you which ones are the ones that actually work :)
Another great online tool is http://www.aqadvisor.com
. Inputting your tank specs/ filter and stocking here and it will let you know whether you are overstocked. it also lets you know whether the fish you chose are compatible etc. Its such a wonderful tool and I love it!
I believe is also important to look up what size tank we should get for which fish. for example, even if a small school of mollies fits in a ten gallon, the recommended minimum tank size for these are actually 20 gallon. This is to ensure that they have an ethical amount of space to move around in :)
Lastly, some fish like corydoras (corys), guppies, mollies, platies etc are schooling fish! It is advised to get 4 or just having one will make that one little fellow very lonely and stressed :( this will lead to a compromised immune system and allow the fish to be easily susceptible to disease and infections >.< Sent from Petguide.com App