having limited ventilation can be key to keeping up the humidity spikemoss requires. The golden spikemoss in my breeding azureus tank, which had no ventilation due to the glass top, completely took over to bottom of my vivarium to the point that it was difficult for the frogs to move around. My setup had a false bottom with a few inches of water, right above it was egg crate, 3in of hyrdroton and a few inches of sheetmoss on top of that. since then I removed most of the spikemoss and replaced the sheetmoss with pea gravel to reduce its growth. hope that helps.