Before you add new fish, let's take a good hard look at your water quality. Do a full check of all water parameters, from hardness to acidity to mineral content to ammonia. Let's also check your substrate for fungus, dead places with no circulation where bacteria can build up, your filtration system for likewise, your decor for cleaning... Something is wiping out your fish and causing spikes in your readings. Also, call your town's water provider and ask if they had any variences or new additives in recent times. The water from your tap is'nt always the same thing every week, and you'd be suprised how many times they change the mix in a year.
Problems usually have a source. Sometimes it's a source you can locate and effect. I once had a problem caused by a hollow ceramic wood decoration. It filled with water, that then stayed stagnant, leeching bacteria and toxins directy into the water. Anerobic bacteria might have built up in your substrate and started releasing lethal bubbles, sift it with your fingers and see if you get bubbles. Debris building up at the base of plants can be a source of bacteria that's not easy to clean out.
Check your tank out for problems before you give up. It's a living ecosystem,but a very small one. One bad spot can skew your whole tank into being unhealthy.
Problems usually have a source. Sometimes it's a source you can locate and effect. I once had a problem caused by a hollow ceramic wood decoration. It filled with water, that then stayed stagnant, leeching bacteria and toxins directy into the water. Anerobic bacteria might have built up in your substrate and started releasing lethal bubbles, sift it with your fingers and see if you get bubbles. Debris building up at the base of plants can be a source of bacteria that's not easy to clean out.
Check your tank out for problems before you give up. It's a living ecosystem,but a very small one. One bad spot can skew your whole tank into being unhealthy.
