I just set up a 20 gallon tank, with an on the side filter...I put in two Tiger Barbs, two spotted puffers, tow Goldfish, and one small Plecostamus. The first day, my aunt seemed to think that they might have "fin rot" as in they came that way from the store...so I treated them with tetracycline almost immediately. About a week went by, and everything was okay, except for the water being cloudy. Then I noticed that one of the puffers is extremely aggressive, and before I could do anything about it, he had nips the fins completely off the plecostamus, and rendered it unable to swim. It died about two days later.
A couple days went by, and the fish started acting strangely, and sitting on the bottom of the tank. They also had what looked like a white film over their bodies, and the water in the tank seems to have a deep reddish hue to it. Shortly after this, the larger puffer of the two (the aggressive one) decided to kill and halfway eat both Tiger barbs...which were also showing signs of this whitish film on their skin. I removed the goldfish. The smaller puffer looks like it's about to die. The aggressive puffer that killed three fish is the only one that remains, and he actually seems to be doing well surprisingly.
I had the water tested, and they said that all parameters looked fine, except that the water was a bit on the hard side. I have been doing partial water changed every other day, and have added aquarium salt to try and keep stress levels down I guess. What would the be the best thing to do, and why is my water red??
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