Yeah go with magfloat. Don't mess around with the smaller magfloats though. Go ahead and get the biggest one (usually around 20$), it will work much better than the smaller ones and is far less likely to fall off inside the tank, which means you have to fish it out of the tank, no biggy but annoying. For removing the encrusting algae, I recommend Kent's Proscraper. It does a great job and I wish I'd gotten one much earlier than I did. With both the magfloat and the proscraper, make sure you get the kind intended for the type of tank you have (glass or acrylic).