Help!!! I started a 10gal freshwater tropical tank about 6 weeks ago. 2 sunburst 5 guppies & 1 Algae eater. Ammonia levels are extremely high 4.0-8.0. I’m not over feeding, doing 3gal water changers every 3 days. Also allowing tap water to sit for 48 hrs with quick start and stress coat before adding to tank. Fish seem happy. Water temperature is 76°. I also clean rocks with with Quick vac pro when doing water changes. I just removed all the fake plants to see if that helps. I’m extremely frustrated and don’t know what else to do. I’ve done everything Thd employees at Petco and Petsmart have told me???