Not sure how they are going to fair. I didn't expect them to even lay in my hard water. Plus there are a trio of lents in this tank as well. I need Peathenster to chime in with the time table on these guys. Seem like the pick up the eggs on day 2 but I can't remember for sure. He had mentioned they look a good bit different then his pair so I'll be interested to see if they do the same thing his did.