If the tank is covered, replace them with spiral cfl bulbs. Look for some with a light spectrum of 6500k. If you can't find 6500, 5000 will do. Plants need a different spectrum than the old fashioned bulbs put out. It may not die, but won't grow much. And it's a 10 gallon so you can get two small wattage bulbs and be good. Probably use less electric than the old bulbs