Another thing you can do so its easier for them to lay & fertilize the eggs and reasonable price wise is get yourself a couple 12" - 15" lengths of pvc pipe. Personally I use the white at least 1" in diameter but I use the 1-1/2" diameter and place it at an angle in one of the corners of the tank away from the filtration. And if at some point you decide to try and artificially hatch the eggs this makes things easier getting them out of the tank