Hi- newbie here. I have a 3.5 gal. tank with heater set at 78, low flow filter, lights, 1 tall silk plant, pea pebble substrate, betta leaf & terra cotta pot in it, running for about 20 days. I had added API Sress Coat, API Quick Start, & Seachem Stabiliy. Then about 12 days ago found out that I...