of coarse if clean gravel.
You can but you can get a bead box at walmart or Kmart also target,willgreens and best for last dolor store
A heater can raise the temperature of a fish tank if needed
Like for a fish tank? In that case, I'd recommend a 50+ gallon sparce dirt/graval tank with driftwood, long stones and maybe a cave/wide arch of some kind for it to hide in. Try not to use plants because they would be either eaten or uprooted. And keep the water tropical, a nice 73 to 83 degrees. Have fun! :)
no because if its a freshwater tank the rain has salt in it
The mass of a fish tank should be measured in kilograms.
depends on the size of the fish, there might not be enough oxigen in a small fish tank.
The simple answer is yes.
math
Of course you can.
It will either have to get used to it or die.
no
No