You will find that there is some disagreement about which fish are the easiest to raise, but Danios and Barbs appear on almost everyones list. On many lists you will find Tetras, Guppies, Mollies, Swordtails and Gouramis.
This will depend on how large the fresh water tanks are. Each person shoud have at least 5 gallons of water per day
By their pumps and ballast-tanks: allowing water into the tanks to raise the vessel's density so can submerge, or pumping air into the tanks to displace the water and allow the submarine to surface.
No just fresh water and a loving home! :)
No, you should be able to use it
The water will evporate on its own over time.
Mollys (Poecilia sp.) are usually regarded (and kept as) fresh water fish but they actually come from brackish water originally. With slow and carefull conversion they can be kept in fresh or salt water environments.
The Culligan man is the easiest way to get refill tanks for a water dispenser. Usually only costs about $20 per month. It seems that Costco and Sam's Club are now offering this service.
Yes, Gibraltar has several sources of fresh water, there are two distillation plants, supplemented by boreholes, natural water catchments in the rock and they collect rainwater in very large concrete tanks.
No, any additional animal put into a confined volume of water will increase ammonia levels and will therefore not keep water 'fresh'.
You can do this by two ways. You can change twenty percent of the water daily with fresh water until it is all changed out. You can also buy a chemical cleaner like Algone and dissolve it that way too.
Most pet stores that sell fish also sell fresh and salt water fish. Read up and learn about salt water tanks because they are different to take care of than a fresh water tank.
Saltwater fish require salt water, and fresh water fish need fresh water, you can't mix them, or the fish will die. You need to look at each individual fishes needs as to what temp they need their water to be. There are some saltwater fish that can survive in fresh water, but it is not healthy for them.