Kudos on the larvae catcher, definitely going to try that!
Glad I can be of help. I forgot to mention some things about it:
I have the end pointed right near the eggs in hopes that they will immediately get sucked up. At night we turn out all lights of in the room including the sump light. No moonlights, etc. I place a small flashlight on a table right in front of the bottom of that tube so that if the fry don't immediately get sucked up, they will swim toward that light. With all other lights out in the room, they should swim right over.
I also turn off all but one of the pumps with is an MP20 in night might mode and I turn it all the way down. It's just barely enough flow to keep proteins from causing big long strings, but not strong enough to push the fry away from the uplift tube. I also **** off the RBTA so that he closes up for the night and doesn't make a snack out of the fry that are immediately below it when open.