I will get the nitrites tested as soon as I can.
For filtration: I have an aqua clear 70 filter...and only a 20 gallon tank. Shouldn't that be more than enough? It also has a new biomax pack in it..maybe it hasn't been there long enough though. And I replaced the carbon not too long after I replaced the biomax (because of the medication) so maybe thats not helping with the low reading..
This tank is only two weeks old.