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i need to update my lihjting in my tank i have a 20gl fowlr just started not to long ago and i only have a 15 watt light what should i go to ? that is not to much money
you should go to power compacts. and with a 20 gallon tank i would say you need at least 65 watts, if your tank is the standard rectangular shape i think that would be 24"X12"X16"? so a 1X65 watt fixture would be nice, or if you would ever want to have corals you should go to a 2X62watt light. a good company would be current USA i use one of their light fixtures and it has served me very well. the 1X65watt runs around 60-65 dollars on the net while the 2X65watt light runs for about 125-140 dollars. you could probably get away with having some soft corals with the 1X65 fixture but that is about it for those.
but the main thing is once you upgrade and add supplements to the water (if you have not already) for the rock you should see some very good corraline growth in no time because you don't get nearly as much growth with a 15 watt NO bulb as with the power compacts.