Well, pretty or not, you should learn to love the worms. They are the most beneficial organisms you'll ever find in your tank. They are amazing scavengers, cleaning and eating what few other will. If your worm population drops, you'll see an increase in detritus, algae, cyano, nitrates, etc. Seriously, you want these worms. The only reliable way to keep them "under control" is to not overfeed. Introducing organisms specifically to eat them is a bad idea because it can seriously upset the natural balance in the tank. Learn to love the worms!