2. Water Circulators: making sure your fish has enough dissolved oxygen to breathe is extremely important, and it isn’t an easy task to do. There’s no way to increase the amount of oxygen in your tank without buying a device. Now, there are some filters that act as a water circulator, but not all of them do. And if you are feeling like your fish are unhealthy and don’t get enough oxygen, maybe getting one is worth it.
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