Hi there, my sister keep goldfish in a little tank (they are really small fancy ones) and she has decided to upgrade her goldfish to a bigger tank, thus leaving here with a 19litre (I think thats about 4gallons) tank. She wants some tropical fish - now I can help her set up the tank, and cycle it etc etc, and I have already bored her to death with water changes, nitrates/nitrites and amonia (lol). The thing I cannot do - (the smallest tank I have ever had is the hexagon one I have now - a 18 gallon - don't forget my new 210 litre ) Is help her stock the tank - I have no idea what she could have in a diddy tank, she wants neons, but would like some others too - will the little tetras shoal togther - I.e if she had say 2 neon, 2 head and tail lights, and 2 rummy nose? I really don't know how to help her with it, I have insisted she does a fishless cycle - mainly because of the size of the tank - it would stress out the fish sooo quickly if it got toxic! Any help would be great - she is kinda looking to me for advice so I have to come and get some first lol Thanks in advance.