Cause of random sudden death?
Can't figure out if I am doing something very wrong or if it's just "bad" fish.
Started up a 50 gal. community tank 3 months ago. Tank has been cycled for 1 month. I have been gradually adding a few fish every couple of weeks. Right now I have 2 Silver Dollars (1 small/1 large), 2 scissortails, betta, 2 cory cats, 3 baby Mollies (mother died but babies are thriving), Bala shark, hatchetfish, a few other tetras, and a platy.
I have been doing a 10-20% water change every week. I had been adding a small amount of salt (approx. 1 T./5 gallons)for the Mollies but I read the Cory's can't handle it so I may discontinue the salt. I use well water. The tank readings have been fairly constant Ph: 7.5 KH: 5-6 dH GH: 12-13 Ammonia and Nitrite are both good. Temp: 75 F
I tested the well water today and the readings are about the same as the tank.
So, here's the problem. In the past 2 weeks I have lost 2 swordtails and a platy. These had been in the tank for awhile so should have been acclimated. From what I have read, these fish should like my water (fairly hard, high Ph)and it should be the tetras giving me problems. I have lost a few other new fish but I can attribute that to stress. I do have problems with ick every time I add fish and I did treat with Maracide a few weeks ago. Yesterday I used Aquari-Sol instead (it's milder??) and a swordtail was dead overnight. I thought he looked fine a day ago. Do you think it's just the medicine causing problems? If so, what should I use for the ick? I've read about using salt but will it be a problem for the catfish? Or did I just buy some "duds".