The T-5 fluorescent is tubular and 5/8-inch in diameter. What’s great about the T5 is that it is inexpensive, produces low heat, and grows most corals in marine aquariums aswell as being suitable to grow fresh water aquarium plants. They are still the number one choice for many tropical and saltwater aquarists today with several different bulbs out on the market to cover all spectrums for your fish tank. We recommend you renew your T5 tubes at least once a year.
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