It is reported that they loose colour if kept in a low light situation for a good length of time.
scales
colour
no
A guppie is a tropical fish and should be kept in an aquarium with other tropical fish, a goldfish is kept in a bowl or tank in cold water - the 2 cannot be kept together because of the different in the temperature of the water
Just leave the aquarium at room temperature.
Goldfish are a hardy species and can survive in worse water conditions than most fish. The basic rules for keeping fish healthy are :- 1 inch of fish needs a minimum of 1 gallon of water, a permanently running cycled filter and at least 50% of its water changed every week. If you apply those basic rules your fish should be OK. I am assuming you are not trying to mix Tropical fish with Goldfish. If you are, then you need to get a heater for the tropicals so that they can be kept warm enough (75F). The goldfish would need to be kept in a different tank that has no heater.
Technically , both require different environments. Goldfish likes cold water and angelfish likes tropical. However, goldfish can survive in warm water so both can be kept, leaving one of them unhappy.
Well, the correct answer is no. But when I kept my tank at room temperature, I had no problems.
I do not know of any Algae eaters that can live in cold water . Goldfish are cold water fish. So unless you can find some species of cold water algae eater the answer is no they can not be kept together successfully.
No. They require totally different conditions. Goldfish are cold water fish and should not be kept in water above 70F. Plecostomus sp come from the tropics and should be kept in water above 75F. If you keep them together one or the other will be in conditions that do not suit it so it will probably sicken and die.
Yes they can
There is no record kept of the "oldest Goldfish" but I have known them to live for over 20 years.
The goldfish should never be in the same tank as guppies. Goldfish are coldwater fish and need to be kept below 70F. Guppies are tropical fish and need to be kept above 70F.
Your poisoned water (Lack of care) is killing/has killed your goldfish. You really must follow the basic rules of sucessfull fishkeeping if you want to keep fish succesfully. The basic rules are . :- 1 inch of fish must have at least 1 gallon of water.(A goldfish is a 10 inch fish and so needs at least 10 gallons of water.) :- Every tank must have a permanently running 'cycled' filter. :- Every tank must have at least 50% of its water replaced every week.