They are eggs and the clear ones are fertilized. Tetra eggs. Since they are attached to the side, they’ll probably get eaten. If by chance, you can gently remove them with a net then you can place them in a QT tank half filled with water. Then watch them hatch. I have removed some before but easier if in a plant that you can lift out. Check the plant and see if any clear ones in it. They’ll hatch in a couple of days and you’ll find tiny lines on your glass which will be the fry. About 2 or 3 days after hatching you’ll have to start feeding. Hikari First Bites are easy for fry to eat. It’s a powder.