hi when i bought my tank i got a few bottles of chemicles with it aqua plus,nutrafin cycle, nutrafin waste control and nutrafin plant grow ive put in aqua plus i have a 55 gallon tank so i had to use about half the bottole this seemed like a lot of chemicles espeshaly as it instructs me to do it every seven days. This means im going to be using a hole bottle every two weeks and if i use the other chemicles as well its going to cost me a whole lot of money every 2 weeks. So how important is it that i use every chemical every week. Any help welcome