Algae everywhere

With 220 watts over a 100g tank I believe you may need to have a co2 setup to successfully outcompete the algae. You don't say how heavily planted the tank is, but it should be planted on the heavy side. You also don't mention tank inhabitants. Fish such as bristlenose cats and ottos will do their share of tank cleaning. That being said what I would do if it were my tank is first invest in co2 if you haven't already. Add more plants if its not at least moderatly planted. Add algae eating fish. Lastly remove algae daily by hand and do daily water changes until its back under control.

Edit:

Sorry you do mention tank inhabitants. I must be losing my mind.

That much lighting without co2 being added doesn't help the plants as much as it helps the algae. You could have some other nutrient imbalance, but I would bet that its too much lighting without co2 that is causing your problem. As far as the 3 ottos they are probably stuffed as it is with that much algae available. If your plants can survive and grow in low light conditions then it may be necessary for you to go with just one set of lights on in order to keep the algae down.

hate to mention this but the few inhabs other than ottos none eat algae in volume. I would look at maybe a chinese aglae eaters or a few snails like the apple which has to build nest out of water to breed so breeding them wont be a problem. the two I have cruise the tank pretty quickly. the trick to getting rid of algae in my expierences is have animals that like to eat it and to also get plants that will grow fast enough to compete.

Sorry to add to the con side Heady, but Hound is dead on. You need CO2. Time to start saving up if you can't currently afford it. I'd wager that not only will adding CO2 help your algae problem, it will help your plant dieing off problem too.

No amount of algea eating fish can do what a proper nutrient balance (let's include light as a nutrient) can do, which is stop the algea in the first place, or rather, keep it in check enough to allow the fish, snails, shrimp to do their job.

The reason that algae keeps coming back is that you never really get rid of all of it, just the stuff you can see or easily catch. Algae spores float around in the water, in the air, pretty much everywhere. When the conditions are right, they'll bloom. The key is to keep the conditions favouring plant growth. Most fast growing plants can outcompete algae if the balance is there, but algae are far better scavengers when there's an imbalance.