HELP! - My tiger barbs keep dying
Hello every friend,
I have a 55g planted aquarium with 5 mollies, 5 platies, 3 catfishes and 1 algae eater. The tank is quite stable. I put 4 tiger barbs (2 males, 2 females) last Thursday. Last weekend, I was out of the town. When I came back home at Sunday night, I found one tiger barb died. In the next morning, another one died. Now I also find the third one is not normal. It drifts along and has its belly upward. Although it's still alive. It looks it's dying. What happened with them.
Please help me. Thanks in advance.