My Guianacara have spawned!!
Interesting turn of events. I was away for 3 days in Denver over the weekend. When I came home Sunday afternoon and was looking over the tank thinking I need to do a water change and scrub some alge of the glass. I noticed one of my Guianacara was really chasing everyone away from one of the basalt slabs in the back of the tank. After closer inspection I noticed on each side of the black vertical body line there was now a vertical cream line. Alsa he had a cream spot behind the vertical line on his head. So using a led flash light on low I began to investigate. Sure enough his little lady was stashed behind the rock fanning a clutch of about 50-75 light tan to dark cream colored eggs. They had excavated behind the rock creating a fair sized cavity.
The unfortunate issue is this is a community tank and if they do hatch any fry I doubt they will survive. There is good news though, I picked up a 60 cube on my way home from the airport for some apistos. I may fish those two out and put them in there with a pr of cacoutodius. Thinking they may co-habitate together nicely.
On a side note I have been unable to get a good pick of the pr of there spawn due to the location in the tank and the pr hiding behind their rock.