I have a 55 gal too. Its hard to regulate temps and humidity, but it can be done. The heat pad is a must. Make sure you cover 3/4 of the top of your tank with a wet towel, or plastic wrap. It took me almost a week to get the humidity right. Remember bad humidity will almost always cause a bad shed. I don't use a lamp at all because with that much area it dries it out, but it's probably the bulb i used, not the lamp. I bought a waterfall, which helps a lot. Of course, that would put you over 50. Sorry, i'm not much help. Start with a heat pad and a digital therm to read your temps and humidity. Try the towel, and go from there.