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i have a 20 gallon tall tank.. 24l x 12w x 17h are the dimensions. .. im looking to put any kind of species or corals.. if i put a metal halide light on there what would be a good watts? 70? 100? 150? some one told me that 150 is too much, and i seen ppl with a smaller tank go with 150 also...

hello nanotank.com community!! im absolutely new to nano tanks and the whole saltwater fish aquariums!! i love the colors of the saltwater!! I have 20 gallon tall aquarium lying around my house and want to make it a nano tank with reef and fishes!! Ive been watching this...