The mass of a fish tank should be measured in kilograms.
Can I use soft water in a fish tank
I'm not sure but you could google it and find the weight and use a calculator to find the mass. Sorry if this didn't help.
A heater can raise the temperature of a fish tank if needed
yes you can yous pea graval in a fish tank i looked it up and i yous it in my fish tank for my babies i luv them
What do you use to find mass
Yes! You should never use chemicals to clean your tank, especially while there are fish in it.
no because if its a freshwater tank the rain has salt in it
It will either have to get used to it or die.