UPDATE: did a 50% water change this morning, before the morning feeding and the daily dosage of prime and Stability. also, the tetra nipped a small bit of the guppies tail off. Took the tetra back, and asked a few questions. it's just my little guppy now, he seems so lonely. the water tested slighty better that yesterday, but i still havn't been able to find a tester. i might just mail order one. ammonia and nitrates are at acceptable levels, but nitrite is still high. i'm going to keep dosing the tank with prime and stability. i do about .25-.3 mL of stability and about less that .1 mL of prime daily, every morning. should i step up the dosage/ammount, or decrease it? Also, should i be on the lookout for fin rot? i know that it can happen after a fish's fins have been damaged.
EDIT: I managed to snap a higher res picture, remember to right click, and open it in a new tab