I use my homemade siphon I made out of airline hose with a couple of chopsticks attached to make it ridged and my thumb functions as the control valve for more control.
Making about 50-60% daily water changes-for larger spawns I will make twice daily water changes-usually about 20-30min after I feed.
I siphon into an old 1gal ice cream bucket with a handle-then I use a flash light and shine under the bucket to help spot any fry that might have gotten sucked up. I use my little siphon to suck the little fry up into the tip and place back into the tank.
I refill by gravity for the first two weeks-I have hooks over my tank so that I can hang my ice cream bucket with like temp dechlorinated tannin stained water back into the fry tank using my siphon that is clipped to the edge.
After 2 weeks-I refill with like temp dechlorinated water from 1gal milk jugs pouring the water over my free hand to displace the water flow so not to injure any fry.
I like to keep common snails in my fry tanks-ramshorn, pond and trumpet-they help create infusoria for free range fry food and help clean up any uneaten food, dead/dieing fry, decaying organics-the snail poop is much safer for the fry tank and easier to see than the bacteria created by decaying organic matter.
As you can see its a pretty simple setup-I used twist ties to attach the chopsticks-but have since changed that to the black electric tape and that works better-the twist ties would hang up on the plastic veggie wrap and tear it.
I like to start my siphon on the top first to remove any surface scum before the water level gets to low-then I start on the bottom..