yes...i have plans to get a bigger tank. 1 green phantom, 1 royal (recently transferred out..worried abt a sunken stomach), 1 albino bristlenose, 1 vampire, 1 flounder, 1 red lizard, 1 gold nugget.
That is 6 plecos, and yes I'd say you are overstocked due to aggressive natures of the different plecos. The vampire needs a seperate tank from the green phantom, royal, gold nugget and the red lizard.