the chances of eggs or fry surviving for more than a few hours with their parent tiger barbs is absolutely nill. If you have a large grain substrate size some eggs
might survive, but the fry would not. Tigers will try and eat anything they can get at, and if they can get in to lay eggs, they can get in to eat them.
If you want to raise them,
this website is very useful.
Personally, i use an 18x10x10 inch tank, with a sand substrate, sponge filter, and 3 pot planted dense bunches of water weed.
They usually start spawning at day break and this lasts for a few hours, they generally target egg laying at the base of plants. The eggs are clear, and very sticky, they look almost like oxygen bubbles on the leaves.
Remove the adults after approx 3 hours (if they are still breeding and not paying attention to the eggs, then leave them longer).
After approx 36 hours (depend on temp) they will hatch, but will be near impossible to see, they will look like shards of glass, with 2 miniscule black dots on the top, and will be attached to the tank sides, plant leaves, or anything else where the water flow is calm. When they start shuffling along the tank walls a bit (usually the 3rd\4th day of hatching) i usually add a few drops of liquifry to get some infusoria growing, then when they start free swimming (or shuffling across the bottom, as more it looks), i then use full dose liquifry. And then progressively wean them across to brineshrimp, and to flake.
Good luck
