The filter should grab the rest of the floating particles or you can just vacuum the bottom, I'm guessing it back flowed into the tank when you unplugged it? Keep up on water changes if you are worried. The guard you made is a good idea if you have a strong filter. You should be able to pull the net off and clean it too if big stuff gets stuck and ruins the filter's flow. In the future if you wanted to you could put a prefilter sponge on there or make a small fry tank with only sponge filters. That's what I do on my guppy tank and it has saved a ton of fry. Most of my convict and salvini fry are just fine though even without the guards on the big tanks, they seem to be able to avoid the strongest flows.
As far as the fry go, once they hatch they will be wigglers stuck to a rock or something for about 3-5 days, and will be moved around by the parents (probably the mama). Then they will start swimming. They will eat microorganisms like algae, and the slime coats of the parents at that stage. You can feed them something like daphnia while they are teensy. Then eventually when you think they have gotten big enough you can use powdered normal food to save money. Just put it in a baggie and smack it with a hammer, it works pretty good haha. Hikari has a specific fry food called first bites too, although I haven't tried using it yet. You should aim to feed them a small amount at least 3x a day once they are getting bigger. They will grow pretty quick with plenty of food and water changes.
As far as an overabundance of babies, I would let nature sort it out, that way you have the strongest and healthiest offspring. You should probably also watch out for any defects (curved spines or other problems), in that case you should cull the fish before they can breed or if they are really suffering. Fry make great nutritious snacks for any other tankmates or other fish you keep, I would do it that way.
Hope that helps. Oh and to post videos I think you need a few more posts. There should be a thing where you can upload media at the top of where you make a post.