Snails & Nitrate

Hi

I was just wondering if snails or algae eaters add much to the production of
amonia in a tank.

My excessive nirate issue seems to have been resolved, but now I have a bit
of an algae bloom happening. I've been treating the algae for a couple of
weeks with a product called Algae Clear, but it doesn't seem to be having
much of an effect. The plants, young thin strappy things (still don't know
what they are sorry), aren't doing very well either. I'm thinking of buying
some mature plants to put in the aquarium in the hope of balancing things
out this weekend.