In a way but not best use of the term. Appliance implies kitchen device
Filter a fish? Do you mean filtering a fish's tank? Well you have to filter any fish's tank.
Yes you do need a filter in your fish tank ifyou don't the tank will build up dirt and the fish will die. Also when you get a fish tank you need to clean it out then fill it with water then put the filter in and wait 24 hours. This helps to ensure that the tank is somewhat stable before adding fish.
The filter removes the fish waste and some of the other impurities.
A filter...
Then your filter is not on.
no filter because for smaller fish it can hurt or even kill them and for the old filter use bigger fish
yes
Yes
ALL fish need filtration.
Freshwater setup: MUST HAVE: Tank, filter, filter pads/media, heater, light, fish, water, electricity, fish food, place to put tank NICE TO HAVE: Substrate, decorations, tank lid
take the fish out immedietly and drain the water. after you have drain the water wipe the inside of the tank with water. DO NOT USE SOAP TO CLEAN THE TANK, ONLY WATER. after you have done all of this clean out your filter and put a new filter sheet inside of the filter.
yes or else fish dies