The correct lighting in an aquarium is very important; it should help the fish to look their best, allow plants to grow, and above all be safe - we all know care must be taken when using electricity near water!
Safety first
This has to be the key concern
Good lights for the fish
Good lights for plants
Many aquarium species are territorial; these should only be kept with other fish in a larger tank with space for each. In a well-stocked dealers tank there is no chance to set up a territory, but problems will arise once introduced into your home community aquarium