It stayed algae free until I decided to rip it all apart and re-scape. Then, the cycle started all over, and then I moved have started over yet again. I think that planted aquariums go through an "algae-phase" and then it just disappears (assuming you have the right amount of light+fert+etc... ) . the tank I have just set up is going on 3 months and I can see the algae issues starting to subside. I fully expect that in a couple more months it won't be an issue as long as I don't do anything drastic.
I have tanks with both high and low bioloads. In my 45 gallon I have a very light bioload (10 Corys, 3 Otos, 1 SAE), a little GSA, and that's about it. In my 30 gallon, I have a very heavy bioload (2 full grown Silver Veil Angels; 15 Cardinals, 8 Rasboras, 6 Corys, 3 Otos, and 1 SAE) and no algae!
Both tanks have medium to low circulation; about 2 WPG; CO2; dose PPS-Pro; use Glutaraldehyde at 2X rate; and have a 6-8 hour photoperiod split 50/50 morning and evening.