I have a 55 gallon tank with 20watt GE Growlites, 1-40 watt GE Chroma 50, and 1-40 watt Silvania Wide spectrum grolite. My tank is planted with a lite fish load, 3 angels (small), 4 neons, 2 mollies, and 4 dianos. All of a sudden, the tank is covered with a reddish/brown coating. Is this probably and algae? and how do I deal with it? TV