one was a juvenile the other same age as one of my first 3 fish i put in the tank. the pleco maybe a week to two weeks old. did a **** of a job cleaning my tank ill give him that. the tank is maybe 2 months old now i think. i stopped keeping track and testing the water till these two died. and just got done doing a 10 gallon water change which is more then i've done on this tank i normally do 5 gallon water changes.Age possibly. Agression/bullying? Have they all been together for a while or are some newer?