On Tuesday night I came home and did my routine maintenance on my 29g. I took out my Rena XP2, cleaned it thoroughly (with tank water) and did a nice healthy water change. Well I woke up the next morning to find my water was dark yellow. I quickly did some water changes and it went away. Later that day, after running some errands, I come home to find the water yellow, AGAIN. But this time, there was 5 dead fish along with it. My rainbow shark, bolivian ram, german blue ram, a keyhole, and a cory cat (All, with the exception of the shark, were under 1") were all lying on the bottom with their eyes bulging and mouths open. I did more water changes, and removed an extra HOB filter I had on their. I was sure that was the issue, as I had ran it after the used filter media inside had been dry for quite some time. Now today, I woke up to find the problem had not gone away. I am completely clueless as to why this is happening. I cleaned the intake and outtake tubes on the Rena thoroughly, as well as a good cleaning of the motor and baskets. I cannot figure this out. If anyone has any advice or insight as to why this is happening it would be greatly appreciated.
