A fish could actually live in a bowl of human blood as the blood of human's and the pH level of normal water is close enough together to not endanger the fish. You would also have to have oxygen in blood, which is very possible because red blood cells have hemoglobin, which can take up to four oxygen molecules on it, two on each side. As long as the temperature is pretty much the same as what the fish needs to live in, the fish can easily live in a bowl of human blood. But that is very sick if any one tries that, to use that much blood, and actually stick a fish in it is just unnatural
First of all, I would be very concerned about anyone who has a tank full of human blood; my tip to you... RUN
Although human blood carries oxygen using cells, it's too dense to allow a fish to use it as a source for oxygen. Fish need oxygenated water to survive, and should not be used to test any other theories.
I would also suggest a reading of Dr. Seuss' One fish Two fish (Red fish blue fish!) to take your mind off the last Horror movie you watched. :)
No you mook
yes, but it may kill the goldfish
Leaving a dead goldfish in your tank will boost ammonia levels.. You dont want ammonia in your tank. It rapidly kills fish
No, absolutely not! Brackish water has salt water in it and it will die because of that!
Goldfish are very hardy fish and can survive a wide range of water conditions. It wouldn't surprise me if they were the last fish to die after a major tank/water problem.
No, goldfish are best with goldfish with the exception of weather (dojo) loaches, bristlenose plecos, and apple/mystery snails.Although goldfish can survive in warmer water temperatures, they are a "cold water" fish and not a tropical fish.
Yes
No, just one goldfish requires 20 gallons (75 litres) on it's own not just because of it's potential size, but because goldfish are very high waste producers
It is important to remember to put things in a goldfish tank, even goldfish get bored. Some of my suggestions for tank decor are artificial plants and a "hidey hole" for your goldfish.
Depends on the temperature
You should not have goldfish and platies in the same tank ever.
goldfish will survive in tap water but it is best to put a bit of chlorine control in the water plus you will need a filter if you want the water and tank to stay cleaner for longer :)