Drop the temp to 21, add a thick clump of floating plants on one end of the tank as well as the moss, and let the fish get used to this arrangement for about a week. Then do a 30% water change and the fish should spawn very soon. They should spawn repeatedly a few times for about a month, and by then you should have a tank full of fry.
The sponge filter would be good for the fry's safety, BUT it will remove too much of the food they'll need. If you plan on removing the fry all the time and putting them into a rearing tank then that's fine, but if you want to raise them with their parents you'll need to let your water get a little dirty so they'll have enough micro-sized food available for those first two critical weeks.
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