I have tried almost everything. PVC pipes, ceramic caves, pots, more of all of those, simulated droughts, simulated rain, green beans, bloodworms, powerheads, more driftwood, leaves, sticks, everything. I got a total of one spawn in 2 years and it got kicked out of the nest. They hatched and then guppies ate them, but that's not really related. Anything else I can try? Are bamboo caves the final piece of the puzzle for me?