I have a pair of red belly Kribs in there cave right this minite fixing to drop here eggs. With kribs about 3 days before she drops her eggs. The male will move into the cave are where ever there going to drop her eggs at. With mine it's a cave area. The male wil start removing gravel from in side the cave and move it to the front of the cave making a very small hole for the female to get into the cave. Once he's got it cleaned out and the enterance is almost blocked. The female moves in and starts cleaning the cave walls up.
Then on the forth day of preping the cave they move in and lay there eggs. The one thing I like about Kribs is they are super grat fry raisers. They will mate for life and raise the fry togeather. Making them the best parents. To see a Moma and Daddy Krib out of the cave with there fry taking them for a swim around the tank is so cool to see.