Question about planted aquarium and fishless cycling

Using a Aqua-Glo T8 30watt, 900 lumen, 36in bulb. Thinking I need to upgrade.
Lost my male guppie at the beginning of last week. The female that was chasing him was also chasing the new female I added but she has finally calmed down and the 2 are getting along great now. A couple of the little fry are getting brave and swimming all over the aquarium. My pleco seems to be doing good. I see what you mean about a lot of waste. He is just a little guy I hate to see how much he produces as he gets big. My shrimp is doing good as well. I must have acquired snails along with my plants. I have several small ones.
Before doing the weekly water exchange my water peramitors were great. 0 ammonia & nitrites and 20 for Nitrates.