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.
No.
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.
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.