Assuming your pair laid eggs on a moveable piece of rock, or better, clay pot, move the pot to a separate tank when the eyes go "silver" which is somewhere around 14-18 days from lay, and 7-10 days from hatch. but keep a good watch as time does vary between species and environment. The goal is to leave them in with the parents as long as possible as they provide great care in fanning the eggs and picking out the bad ones, but not too long that the hatch and are immediately consumed.
The other separate option which I have used successfully for the last two years is a divider in the (I use a 10G tank for Larva) breed tank with 2 millimeter holes (like a screen) big enough for larva to pass, small enough to keep out parents. At night, as eggs are always layed about 1-4 hours after light goes out, place a small flashlight on the other side of the divide, so that when the eggs hatch, they will swim to the light, through the holes and be protected till morning....then make sure you feed right away and keep a constant supply of food in the water....your can move the parents back for another round anytime.
This process works good but all sides of the tank, except front must be painted black with a 1" square at the bottom which is not painted so the light can shine through this hole. Works great with skunk cleaner shrimp breeding as well.
If you moved them before hatch, You need a small airstone which is placed near the eggs so the water gently massages the eggs and keeps them clean. Once hatched, flow is virtually zero as they can't swim well until metamorphosis occurs, to much flow will damage them, or they will not be able to catch their Rotifers, keep light dim for at least a week. Feed some phyto in the tank to keep Rotifers alive.
You will need a good supply of Rotifers, which have been feed phyto plankton and Selcon, 4 hours before you put these in with the new hatch, new hatch can survive only a couple of days without this food, it must be Rotifers for at least 7-10 days, then transition to pulverized flake.
Good luck and have fun, it takes a bit of learning, keep note of the days before hatch, they are usually very timely..