No algae for Pleco. Help?

This is weird for me. I have four fish tanks, three i have had set of for years and new one. Someone wanted to get rid of some junk they had lying around and they gave me a 30 gallon tank with hood, lights and filter. I washed them out when I got home and a day later, set it up. I waited three weeks and added some pristella tetras and a Gourami. A couple weeks later algae really started to sprout and I figured it was time to get a pleco in the tank. I got a clown pleco, not one I have had before, but I am not sure if this has a reason to my problem or not but I thought I would mention it.

Anyway, so for a week things went well. I left the algae on the drift wood and a medium sized rock when I did a water change. I vacuumed the rocks and rinsed the plants and used the chlorine remover and cleaned the glass of the tanks. Within a day the two inch baby clown pleco ate all of the algae off the driftwood and rock. But my main problem, no algae is growing. The pleco has not eaten in two days. From my experience algae grows fairly quickly and a baby pleco would not have been able to eat what I had left for him so quickly. The driftwood isn't small... its more than a foot long and two inches round (roughly). But there is no more algae and so far, nothing seems to be growing. I have algae pellets but they dissolve before he can find them. I have never had this problem. Algae always grows in tanks. This is my smallest tank so maybe there is something that I should have done that I didn't.

Please help before the pleco starves. What should I do?