Yeah that was the image I had always of pleco's that they were pretty hardy fish, which is why this is so strange to me to have them die, when I was younger we had one in a smaller tank that got to be huge and lived forever!
As for the water I'm pretty confident that the ammonia/nitrates/nitrites are all at 0 or within the lowest/safe levels when we test the water w/the master kit, which is another reason it's prerplexing to have them dying...as I said we did start out the tank with 6 Glofish, they survived the cycling process just fine and only within the past week-2 weeks have been dying off, not sure if it's for the same reasons, but like I said, none have appeared sick in any way, they just began looking slow/droopy before slowly dying off, and the 2 we have left are still fine. So with those I'm assuming they were pretty old when we bought them.
