It is best that all fish have a filter besides Betta fish. Betta fish don't need filters cause the filter pushes them over with their big fins. Goldfish should have a filter on there tank because they are often overfed. If you have a filter you won't have to change the water as often. The only fish that shouldn't have a filer in captivity are Betta fish.
Fresh water
There are both salt water and fresh water crocs.
They (as well as tortoises, their close relatives in the reptile world) have protective shells. Turtle also live in the water, sometimes even the sea.
Salt water freezes at a lower temperature than fresh water, so it typically takes longer for salt water to freeze compared to fresh water. This is because the presence of salt lowers the freezing point of water.
Both kinds of fish can live in a delta area. The line between salt water fish and fresh water fish seems to be getting blurrier. Sharks and other typically salt water fish are found many miles up stream in rivers that empty into the ocean. It appears that salt water fish adapt better than fresh water fish as the fish found in fresh water are not found out at sea.
If water is only drawn from the cold faucet, then no, the water heater is not involved. However, if water is drawn from the hot faucet- even for a few seconds- hot water IS withdrawn from the heater, and fresh cold water drawn in to be heated- even if the hot water did not make it all the way through the pipe to the faucet- and the water heater will work to heat that fresh cold water.
in ponds and other fresh water places Glenn
No, it is not normal for a water heater pan to be full of water. If you notice this, it could indicate a leak or other issue with the water heater that needs to be addressed promptly.
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if the salt or other impurities in 'fresh water' will not interfere with the experiment, yes.
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Yes, like other mosquitoes they breed in fresh, standing water.