Thanks for the replies on the Algae, it's not stressful, it just makes it hard to see my fish!
yea I won't put more fish in, 3 gallons is pretty small.
I've had a planted tank, well not many plants in it but they grew and had I to trim them back periodically etc. Like an underwater garden! Though 3 gallon doesn't seem like a lot to put much into it plant wise either. I'll just wipe the insides down to get the algae off the tank walls.