+1 the marble one is female.
If it’s in a community tank and you want to see the fry hatch, leave the lights on so they’ll continue to guard the eggs. Otherwise, catfish or plecos will sneak up at night and eat them when the parents are asleep.
Don’t be alarmed if the eggs suddenly disappear. The parents will often prepare another site where they will move the fry to. Just watch their behavior...one of them may even be cleaning off another site already. The fry won't be able to swim after hatching and will stay in a wriggling mass. It will be easy to siphon or suck out the fry with a turkey baster at that point.
And like
tlindsey
said, they will spawn again so you’ll have many chances to witness this. In the future, it’s up to you if you want to remove the eggs and hatch them yourself or leave them with parents and let them learn to raise fry themselves. It would be best to put them in their own tank and they should breed again every 10-14 days