i bought some fish for my tank, first of the lot, they are not that big, two are orangey colour and two are striped, lady said they are molly type, and easy to keep, seem very active, round fish, only got four, my tank has been cycling for 6 weeks, and now finally i got to get some fish, and i have two danios in there with the new fish. What kind of fish are these that i bought and does anyone know of a website i can go to look at pictures of all tropical fish varieties and see if they are compatible with one another.
Also, now my tank is fully cycled, how often should i change the water, and if i leave it too long, will my fish die? What does the filter actually do?
thank you
Also, now my tank is fully cycled, how often should i change the water, and if i leave it too long, will my fish die? What does the filter actually do?
thank you


or is it, i do water testing every week and it all seems in hand and the fish seem happy.