Take offense all you want bud.. sometimes 25-30% isn't enough to keep nitrates down... That's what I was implying... Mine need a 50-60% weekly water change to stay down.. A pleco for example 4 inches or not puts off a lot of poop... your pleco assuming its the fully grown one 4 or so inches long.. is probably equivalent to all 10 of my neon tetra's or more..
Lets keep it civil here. In your post you said he didnt do water changes at all (maybe thats not what you meant but if you read it thats how it sounded)