I just lost a plecostomus from my swordtail tank. The swordtails are doing fine, the only thing I can think of is that the pH was too high for the pleco, or that it was sick to begin with. That tank has been going for 5 weeks (see "Help! My fish is sick!") but seems stable now, so I was surprised that the pleco died.
In short: what algae eaters do you recommend for a pH of about 8?
I wasn't feeding anything extra for the pleco, but the swordtails were getting peas every few days and it seems like most of that would sink to the bottom. I fed some cucumber too. Do you think it starved to death? That's an awful thought. I did notice that the pleco had slowed down a lot in the couple of days before it died.