i use the premixed from petco, and everything is good. i used to use the premade from the lfs
, but found that they didnt care too much on water quality (they didnt care about nitrates). ever since ive switched, its been alot easier to take care of (meaning water peramiters). its expensive (10.49 for 5 gal
, every week), but worth the convience (sp) of having my permaiters ok. i dont know if this is what youre after, bhth.