Well, if you have a filter, that’s a good start. Just change your water regularly but you don’t need take your gravel and decorations out each time. If you clean out all your filters and gravel, you are getting rid of the good bacteria and restarting the nitrogen cycle.
Choose healthy fish, learn to quarantine, don’t overfeed, do regular water changes, and most importantly, like John said, read up on the nitrogen cycle
Choose healthy fish, learn to quarantine, don’t overfeed, do regular water changes, and most importantly, like John said, read up on the nitrogen cycle