Chips the Kuhli Loach was just found at the bottom of my tank. My new Panda Cory died after about 24 hours. My other Panda's barbels seem to be wearing nearly clean off of his face. Just now, I realized my Aqua-tech filter is about 3 MONTHS OLD. I've been rinsing it and putting it back in. It looks kinda filthy, now. Is this why? What do I do? I don't want to destroy the cycle, and their filter is off right now. Pet store closes in about 2 hours. Please give me detailed instructions! I don't want to lose my babies to my own stupidity... Thanks in advance!