is your gravel above or below your eco complete? you might have trouble getting any groundcover to spread via runners in a thick substrate. I've had hairgrass, glosso, hc, micranthemoides, chain sword, marselia, and cobra grass foregrounds. the only two that could really spread effectively in flourite were glosso and micranthemoides. none of the "grasses" ever really took hold in the thicker substrate. on the other hand, I've had nothing but success with chain sword, hairgrass, and cobra grass in sand. substrate grain size can really limit a runner's ability to push through and spread along the substrate. Other problems could just be a lack of nutrients (do you dose macros, or just CO2, excel, and flourish?) hope this helps...
Eheim Pimp #171
55 gallon jungle in progress
; Eheim 2217, TurboTwist UVS, Seachem Onyx / Black T-grade ColorQuartz, 2x55w AHS CF, BeverageFactory.com CO2 Regulator with Clippard accessories
"If you ask me, you've got too much imagination. Everything's all loop-de-loops and flibbertigibbets." - Hank Hill