I have a 55 gallon setup w/ all the appropriate equipment. I do monthly water changes of about 33%. About a month ago I lost my 5 or 6 year old plecostomus. I did not notice the fish was gone for a while and was only able to remove the skeletal remains. Shortly after I bought a new one from Petsmart. The fish did not last long. Not sure if it was just eaten by my other fish or if it was sick, again I just removed the remains. It's been a couple of weeks since then. Two days ago I lost my 6 year old Bala Shark and today I came home to find one of my Tinfoil barbs rolled over(this fish is was only about 6 or 7 months old). Is there anything I should be worried about or that I can check. None of the fish have seemed ill. Remaining in the tank are 4 tinfoil barbs, all about six months old. A redtail shark also the same age, a albino rainbow shark, and a fish that I'm not sure what it is, about 6 years old.
Thanks!
Thanks!