you should never clean your tank...
Once a week, do a 15%-25% water change, rinse filter medium in syphoned tank water.
When replacing water, be sure to de-chlor it first or same time if cannot do it before.
With the addition of new water, put a bio pouch in the filter medium, and/or use something like, "aquarium life liquid or geo liguid".
It will help bacteria at an exceeding rate and control all water parameters.
hope this helps, good luck.