I inherited a tank from my in laws, which is currently inhabited by ten fish. 3 inch pleco, 5 inch (gold fish I'm guessing, it's white but has a gold spot on it's belly on each side, between sets of fins... large fins... won it from a fair but has a fun personality!) 1 male gourami (2 inches) and 2 female gouramis (1 inch each) 5 minnows (1 inch each). So, that is 19 inches of fish, the minnows are left over from using the tank as a live-well during the week. The chemical balance is WAY out of whack - I used test strips to see where I am sitting and I feel like I don't know where to begin. I don't have the heart to toss any of these fish and do not have a place for a second tank at the moment. I do have a gravel vac, and it has a filter (it's one that came with the tank, disposable cartridge. OH, I also found a small LIVE plant sprouting when I vac'd today. I attempted a 50% water change using the gravel vac, the glass looks clear (no algae spots)... When using the vac I dig in the rocks but find I stir up more than I clean out. The water has since settled, but still has quite the greenish yellow tinge. Not clear, but not cloudy. My chemical readings are: Nitrate 200 Nitrite .5 Hardness 100 Alkalinity 300 pH 8.4 My test kits I bought do not test for Ammonia, but my boyfriend works for a landscaper and brought home a Pond Test Kit for Ammonia and Nitrates that they sell. Since it tests for the same thing, would that work the same? With the levels so far out of whack at the moment, should I continue with the 50% water changes daily? I want to end up with a nice clean tank since it is in my dining room. I'd hate to start ALL over, and lose any bacteria, but I guess I'd like any suggestions I can get!