Its quite possible that they are eggs if they are transparent or cloudy in colour. If they are all together in a bunch id say its from a snail. But if they are scattered around the tank like on the glass and ornaments and plants id say that u have a laying goldfish. If this is the case and u want them to hatch try not to disturb them. Hope this helps :oD
A small pebble from inside the aquarium
a testicle
Go on google images and type in aquarium snails.
Ball bearings
Get a small Aquarium Fish Net, get the body of the Fish, put it in the toilet.
The center of a marble typically consists of a small piece of glass, clay, or a solid core material, which is surrounded by layers of colored glass or plastic.
They are relatively small tanks.
small balls will bounce higher because they have closer particles
Typically with a glass repair, a filling epoxy is cured inside the chip using special equipment. The filling epoxy prevents a small chip from expanding, or cracking.
Yes, a ball python is considered to be a good pet. The ball python can be kept in a glass aquarium and sometimes even let loose in the home for small periods of time.
No.
Wheel bearings are small metal rods or balls that are placed between the inside of a wheel and it's axle, in order to reduce friction.