put a cave in there for them as if there is going to be eggs they need cover half a plant pot will do or just a rock with a small opening but big enough for them both to get in to or the eggs will be unprotected so other fish will eat them if out in open or other option if you have one put them in a tank of their own ...we did this as he chose the rock cave but our yellow lab female was always going it so moved them to another tank 24 hours later roughly there was eggs as soon as saw the eggs we took mum out so its just dad and babies ...its got no gravel etc at bottom just plain bottom bar the little bit of gravel that got in the net trying to get them out main tank lol