My large plecos go bananas for raw Bassa fish, if my RTC doesn't eat it they sure will, mine also love krill pellets. massavoire pellets seems to be a big hit for them as well, even if the RTC didn't go for them.
I don't think it's overstocked, but down the line, if they start to grow too big (which will probably take several years), I'll consider re-homing one or two (and that will probably be a very tough choice).