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Four-lamp T5 light fixtures are great for mixed reef systems with soft and stony corals. Six-lamp or eight-lamp T5 fluorescent light fixtures are capable of sustaining higher light demanding SPS corals in reef aquariums with the proper reflectors using a combination of proper spectrum T5 aquarium light bulbs.5 Aquarium Light: Great for reef tanks and freshwater aquariums alike [Click here for more info.]. High output T5 aquarium light is a popular and versatile choice for illuminating your fish tank.
Best Answer: You can have a 20 liter tank (5 US gallons) if you want. It would be a very small reef with limited abilities for creatures and fish. Average small salt is around 75-115 liters or 20-30 us gallons. This size makes a nice small reef tank with a larger choice of fish. Unfortunately even a 20 liter tank is too small to house even two mini horses and is way too small for two clowns. going with the 75 liter will be fine for two clowns perhaps a shrimp or two rock and an anemone if wanted.