Lately,I am having a hard time keeping plecostumuses alive. I have had them in the past, the last one I had in my 100 gal tank died of old age(I think). I had him for years with no problems. I hadn't had a pleco in a long time, and I started to get some algae in the tank so I decided to get another pleco. I bought a couple of vampire plecos. They are really a pretty pleco with spots. Any way, one died within a week. The other within a few weeks. My 100 gal. tank has lots of rock work for hiding, I have drift wood in there for them, feed romaine lettuce a couple of times a week, and threw in the pleco food discs at night after I turn off the tank lights. I do regular water changes and keep a pretty clean tank, and the tank mates had not bothered them. Could it be that the vampire plecos just aren't very hardy? Should I try the bristle nose plecos again instead? I can't figure out what is going on.