Aslong as it has enough room and filtration many types of goldfish can be kept together. There are some cases where problems occur as such as the case with Sarassas and Orandas. Sarassas will tend to nibble at the cap of the Oranda causing damage.
A goldfish can live in an opaque glass tank as long as you keep up with necessary water changes. Like a small outside garden pond goldfish are only viewed from the top.
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an aquarium or a fish tank
Rule of thumb is to not mix tropical fish and goldfish.
No. A 10 gallon tank is barely big enough to keep a single goldfish in.
no they need at least five gallons each. a thirty gallon tank is a good size tank to keep goldfish in.
Most people would keep goldfish in a bowl or tank, filled with water. You can always add scenery such as pebbles plants and castles :D
No the male will eat them keep them separate them until they can't fit in the mouth of the goldfish.
It's a possibility, but a goldfish and a platy should never be in the same tank as they are not compatible, and their needs are different
You should put in stones or sand. Also you can chuck in a live plant. xx
Fish of all kinds (including goldfish) will pick on a weak fish if there is one in their vicinity. In general goldfish are peacefull. During spawning season (spring) though, the males will be seen nudging the females in order to get them spawning. So no, they do not normally 'pick on their tank mates'.
Does your snail have algae on it? Goldfish will eat anything that "grows" in the tank. They will eat turtle droppings, water scumm, algae, anything! That is why they are called bottom feeders.