Hello, I need some help with the nitrogen cycle in my tank, it's been a week and it hasn't cleared up, so I went to the pet shop to see the filters and found three Fluval filters (2 canister filters and one in-tank filter) The FLuval 205, and 305, and the Fluval Plus. Problem is these are very expensive, here in mexico they cost about $220, $310 and $100 (USD) respectively. and the only other thing I found were airs tones and air pumps that were more or less cheap.
So I wanna know if there is something besides a new filter that can help for now, and if the air stones will help at all.


