So, I have a grand total of 30 watts over a 55 gallon tank, and my plants are barely hanging on. Well, actually my anubias does fine--it puts out a new leaf every few weeks--but my java fern always looks sad. I have the bulbs I have because that's what my hood accommodates. It has two separate fixtures that each hold an 18 inch T8 bulb. And the only bulbs I see in that size are all 15 watts. Can you get higher wattage bulbs that would still fit my hood fixtures? Or would I have to buy a new hood altogether if I wanted to get more watts?