Zerba fish eggs

Question
I brought my niece two Zebra dianos almost a year ago now. Recently we noticed that one has gotten quite fat I did some research and found out she was pregnant so I put both the male and female into a small separate tank with gravel down the bottom , she laid the eggs and then after a hour I took the male and the female out and back into their normal tank. The eggs are visible down the bottom of the tank mostly in-between the gravel. But it has been almost 5 days since they were laid and they have not hatched I was wondering what the eggs should look like ours look almost like air bubbles clear and little with a even smaller white/yellowish circle inside it. There is no filter in the tank nor heater what should I do to get them to hatch?

Also the water is getting a tad cllowedy should i take about half a cup to a cup of and put fresh water in (with water ager?)

Answer
Hello,
If there clear with yellow dots in they are fertile
CONGRATS
but, they will need a heater and a really really weak filter but that can come later, the heater will encourage them to hatch and they will hatch faster.

Try not to put tap water in especially do not treat it, its better to used aged water, or i use water from the main tank, although its treated its aged and contains good bacteria so its much healthier for the babies, do those one cup water changes every day if its a larger tanks but if its smaller do them every other day.

godd luck and i hope they hatch