There is a lot you can do to combat algae without ever buying "clean up" fish. I should point out first that the Loricariidae, also known as armored catfishes or plecos, can grow quite large and actually be a more of a problem than a solution.
Algae growth tends to be more of a symptom and is much more easily fixed by remedying the root problems. These roots are normally an abundance of resources.
First I would look at where and how you have the aquarium setup.
- What kind of lighting does it have? Does it get direct sunlight? How long are artificial lights left on?
- What is your water maintenance schedule like? Do you do weekly water changes? Have you ever done a water change on this tank?
- How much and how often do you feed the inhabitants of your tank? Do they eat all their food? Does some sift to the bottom?
- Do you have plants? Are some of them dying? Are they flourishing?
All of the above (except living plants, I'll discuss them below) are sources of energy for algae. Light allows them to undergo photosynthesis, create more food and create more algae. Not changing the water, leftover foods and dead plants allows for the buildup of nitrogen compounds used in creating food and again, reproduction.
Move your tank so it doesn't get any direct sunlight because it allows algae to grow more spectacularly. If you have lights on the tank leave them off unless you are watching your animals. Axies don't really enjoy bright lights anyways. If you want to promote a day/night cycle rely on ambient lighting.
Plants are great in that they don't add any bioload (algae food) to the tank like plecos and other Loricariidae. They compete for the same resources as algae and often do better at it. Hardy, low light plants like water sprite, elodea and Java moss help sop up nitrogen compounds in the tank and keep algae from using them. They also have a small amount of filtering ability because of that. You have to be careful because dead plants help algae grow. Prune or remove all dead plants immediately!
I should also add that sometimes manual removal is all you can do. A razor blade and a good siphon will remove algae but if you follow the above advice, this should be pretty minimal.