03-23-2008, 01:34 AM
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How big is your tank? I mean the diamension. If its a 3 feet rectangular tanks i will recommend having 20-30 neon tetras. If you wanna have bigger fishes, then your tank might not be able to house as many of them. And thus will defeat the purpose of having shoaling fish.
The bare minimum stock level for tropical fish is
2.5cm (1 in) of fish per 30 sq cm (4.65 sq in) of tank water surface area.
so if you have a 3 feet tank, the measurement will be 1meter by 30cm of surface area. It can house around 90neons ( their size only around 2.5 cm or 1in). In order for them to leave more comfortablably, 20-30neons will be ideal. And you can see them shoaling.
Hope that help cheers :D