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It never hurts to have a filter it will only improve your fish's chances of survival and decrease your need to clean.

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Q: Does a 40 gallon fresh water fish tank need a oxygen filter?
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Related questions

How much does a water gallon weigh?

1 gallon of fresh water is about 8.36 pounds


Which one is heavier a gallon of fresh water or a gallon of sea water?

If you have equal volumes, the salt water will weigh more.


Does a 40 gallon water tank need a oxygen filter?

It never hurts to have a filter it will only improve your fish's chances of survival and decrease your need to clean.


How do you check the filter in a fresh water well?

How do I check or change my filter on my fresh water well?


It oxygen more soluble in fresh water or in salt water?

Oxygen is more soluble in fresh water.


What has more oxygen salt water or fresh water?

Freshwater has more oxygen than salt water but oxygen is more solublein fresh water.


How much does a gallon of fresh water weight?

The weight of fresh water is largely dependent on its temperature. A US gallon of fresh water weighs about 8.328676 pounds at 70 degrees F.


Do you need an filter in a 1.5 Gallon fish bowl?

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.


What has the most oxygen running water or standing water fresh water or salt water?

fresh water


How do you make fresh water?

you take water and filter it


Does salt water or fresh water filter sand gravel soil and pebbles better?

fresh water and peppels fresh water and peppels


Which environment has the greater concentration of dissolved oxygen salt water or fresh water?

fresh water