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Hi all. I have 20 plus colorful danios in my 46 gallon tank. I just came home and noticed balls, that I believe to be danios eggs laying on the grass and leaves of the plants in my aquarium. Assuming they are eggs and not carbon balls that were pushed out of my filter. Is it possible for me to hatch these eggs? If so what should I do? How long do they take to hatch? I don't have an extra tank with filter, I do have 2 mini 1 gallon tanks though.

Any thoughts or possible things to do would be great.

Thanks

Carbon would be black, danio eggs would be whiter. I've only had white cloud eggs not danio but they should be similar. If you have no bottom feeders to eat the eggs you might be able to leave them to hatch in the tank. Much of the fry will be eaten by the parents if you don't have some good hiding places in heavily planted areas. Otherwise you can remove them to a tank with a sponge filter and do very frequent, very small water changes. They can be sucked out with a siphon tube off a gravel vac or if small enough some air tubing. The problem is you won't have a cycled tank yet to put the eggs and fry into. For future batches you can leave a sponge filter in your main tank to cultivate bacteria and then to a 2nd tank for eggs/fry or at least leave the sponge in your current filter if you don't want bubbles in your main tank.

Snails are very good at creating infusoria to naturally feed fry but very mess so you would have to have a cycled tank already. Liquid food and most other fry foods probably work fine for danios. Doesn't seem like they would be picky or difficult to feed. They are one of the easiest egg layers to breed.

If they are Danio eggs just leave them alone they are tough as old boots and breed very easy. That is providing there is nothing in the tank that will eat the eggs or the fry.

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Thanks for the replies. I only have danios, coolies, and ottos in my tank. The eggs I see are on plant leaves and tall grass, so the coolies aren't eating them. How long do they take to hatch? If I am lucky enough to have some hatch, would I be able to see the frey? How are they odds of them surviving? Should I try and scope them out and put them in a bowl and feed them until large enough to put in the aquarium? How long would that take?

Thanks again!!

Eggs will hatch in around 2 days, give or take depending on conditions such as temperature.

When the fry hatch, they are clear, so it will be very hard to see them, but it is possible. However, they are not freeswimming yet, and will cling to a surface. Because of this, they are incredibly vulnerable. I would not count on any surviving past this stage.
By chance, if there are a couple fry that make it and can continue to evade the older fishes, there are still concerns regarding the filtration, as sham said.