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Algae grow when there is enough light for them. I doubt that 20 watts of incandescent light on a 2.5 gallon tank is enough for algae to grow.
Algae tend to be triggered to grow by a spike in ammonia in the tank. So, a risky thing to try is adding a little water that has a drop, no more, of household ammonia in it (make sure there is no detergent or soap in the ammonia.) You would want to get far less than a drop of ammonia into the tank water - about 1/8 of a drop or less. The risk is that it might kill the occupants of the tank, if you add too much.
Algae tend to be triggered to grow by a spike in ammonia in the tank. So, a risky thing to try is adding a little water that has a drop, no more, of household ammonia in it (make sure there is no detergent or soap in the ammonia.) You would want to get far less than a drop of ammonia into the tank water - about 1/8 of a drop or less. The risk is that it might kill the occupants of the tank, if you add too much.