We started a 29 gallon tank, 4 goldfish in there. Went to our local shop, got help, added beta, bala shark, algae eater and small catfish. They are good there and told us it is an ok mix. We keep the heater at 79, had a filter that had worked with the tank. They tested our water today, it was all good, and we added three live plants and took out the log with silk attached. Our fish, all but the goldfish keep dying. There is no sign that the tropical have been bitten or anything. We are stumped! so are the guys at the fish store. We also went through several glowfish that died. We are desperate for answers!