I hv a 3 ft aquarium. It has a filter, a heater, and plants. However sometimes when my fish die, I can’t tell why. Sometimes I just mix aquarium salts and anti bacterial and fungal medicines when they look sick. Aquarium test kits are not available where I live. The fish store keepers just give me a blank look when I ask for them. One of my friends is coming from USA, and I can get her to get me these kits. She says she is broke, and doesn’t hv the time to go around aquarium shops. Could you provide me with links where I could buy affordable good test kits and maybe other essentials for my tank?