I put Fishie in his new 5 gallon planted tank. I was advised once to use a compact fluorescent bulb in order to grow the plants. I went to the store, and the lowest wattage they had was 60 watts. But it said something like, uses 13 watts... so does that mean it uses 13 watts of power but it gives off the brightness of 60 watts?? Is this too bright for a 5 gallon tank?? I mean, will my fish be bothered by it?