Right now I'm using 2 - 24 inch zoo med T-8 lights. One is a Coral Sun Actinic 420 Coral Bulb and the other is a Ocean Sun 10,000K High Intensity. I'm currently growning 5 plants, 4 seedling and 1 that's 3 weeks old, it's about 5 inches. Is this sufficient lighting or should I double my lights...