one key thing i would suggest is stability in parameters. when i first started out, i started out testing daily, then weekly, then monthly. now I test only bi-weekly for calcium & alkalinity, and monthly for magnesium. this is up to you and what makes you comfortable.
next is making changes. if you make a change, give it time to see actual results. don't expect a change over night, the only change over night is you doing something drastic and wiping out your livestock.
as stated before, never dose/add anything you can't test for - best advice ever
keep up with husbandry of your tank, if you do bi-weekly or monthly water changes, keep that up - again, its all about stability
next is making changes. if you make a change, give it time to see actual results. don't expect a change over night, the only change over night is you doing something drastic and wiping out your livestock.
as stated before, never dose/add anything you can't test for - best advice ever
keep up with husbandry of your tank, if you do bi-weekly or monthly water changes, keep that up - again, its all about stability