Okay, it all started with a one gallon aquarium at a garage sale for $3.00. Then I brought the 29 gallon up from the basement. Now, this past week-end, I bought a four foot long tank w/stand (don't know yet how many gallons it is). My question is, what is the best way of cleaning the tank, the bio-filter, the gravel, etc.??? Can/should I use the filters that are in it, or buy new ones? Any advice would be appreciated.