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yes you can it will be fine. i have experience :) haha
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
You should probably find them a new home and when the time comes to have fish again, you should buy a bigger tank and a filter. Three fish cannot properly live and survive in a 2.5 gallon tank - this is not even safe for a betta
You may be able to use a very small internal filter with a 2.5 gallon tank. You can check with your local fish/pet store and they may be able to show you ones that would work for your tank
length and width for a 55 gallon fish tank
It never hurts to have a filter it will only improve your fish's chances of survival and decrease your need to clean.
Filter a fish? Do you mean filtering a fish's tank? Well you have to filter any fish's tank.
Provided the tank has sufficient water (1 inch of fish needs a minimum of 1 gallon of water) and a cycled filter and a heater set to 75F and you change at least 50% ot the water very week there should not be any major problems.
Your tank filter should be changed every month. If your filter becomes clogged, it should be changed right away.
Yes, every fish tank should have a filter, but depending on the kind of fish it can be exempt. If not an air bubbler is a good idea. The filter cleans the tank, along with putting oxygen in the water, and the air bubbler also puts necessary oxygen into the water.
It never hurts to have a filter it will only improve your fish's chances of survival and decrease your need to clean.
you can put a betta in a 5 gallon tank