Yes. I have a 5.5 gal nano, and the 10 watt bulbs fit. The 20 watt ones did not. I don't know what size of hood you have, but it will probably have to be for a 10 gal or bigger. The 10 watt ones are okay. It is very little light. Nothing really grew in my tank, more just survived. I know use those lighting in my refugium and they work great. I have since switched to a 175 MH. Now things grow. I think that they are a good place to start, but use them only for your first six months (the life of the bulbs) and then switch to something a little more substantial. They are a great inexpensive way to start off with a lighting system that has the proper spectrums.
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Have a good one!
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