i purchased 2 pictus cats about 6 to 8 months ago. they were very small when i got them and spent most of their time in a hollow log ornament in my tank. they started 2 show themselves regularly within the last month and both had more than tripled in size since they were added to the tank. for some reason they both died within 2 days of each other yet all other fish in the tank are fine. dont know if it matters but the only symptom htey showed of anything being wrong was that their wiskers curled or shrivelled. any help????