I just finished building a DIY light strip for my 10 gallon aquarium - I'm getting ready to add plants to a previously fish-only tank. The lighting is two 18" 15W fluorescent bulbs that I got out of an old desk lamp. The only problem is that now that I've gotten it all together, there is a barely audible buzz that comes from the lights (I think it's the ballast). What does this mean? If it's not a problem, will the noise bother my fish?