Originally Posted by Tali
yes i test my water every week since its still kinda new. the parameters are stable so i guess ill look for peat to add to my tank. thanks!
What kitten meant by water parameters is GH (general hardness), pH and temperature. What you are testing is likely ammonia, nitrite, or nitrate. These are not parameters but conditions.
You can ascertain the GH of your tap water by contacting the water supply people; many now have a website. The pH they might tell you as well, but you should have a pH test kit as this is an important test to make periodically. Temperature is self-explanatory.
While the water parameters (all three) can affect fish, it may only be weakening them through stress, allowing some other issue to cause their death. What do tests for ammonia, nitrite and nitrate show?
Also, corys are highly social fish, and must be in groups. It is best to have 5 or more. Some species tend to need others of that species more than some other species, but generally I aim for no less than 3 of a species where you have two or more species. This will add stress to the fish as well.
You can read more on stress here: http://www.tropicalfishkeeping.com/f...um-fish-98852/