Hi there, So my tank has barely finished the nitrogen cycle. however i still have .25 ammonia when i do my water changes every 3 days. I think this is because of the small size of my tank (7.5 gallons) i just changed my filter media (not the bio media) and added aquaclears ammonia remover. diddnt really seem to do anything. I have noticed a discoloration on the water surface and did some reasearch. the closest thing i could find was what some people called an oil slick. now i dont have an oil well in my substrate lol so what is this? Is it harmful? what should i do about it? I also get some bubbles on the water surface right by my HOB filter. I read these are caused by silicates is that true? I just recently lost my job so buying exensive products just to keep my tank looking good really isnt an option right now. However if the lives of the tank inhabitants are in danger then I MUST do something. The plants are included in that also. another side note. would more plants eat up that remaning bit of ammonia?