Measuring Levels of Oxygen in Aquariums with Different Filtration Systems (Vlog #13)

The amount of dissolved oxygen in our aquarium is very important for healthy life of our aquarium creatures and it should be at least 8mg/L of water. In past week I have observed my juvenile guppies gasping for air in Aquarium that was ran by hang on back filter and this has not been happening in any other aquarium with sponge filter. In today's Vlog I will be testing what is the difference in levels of dissolved oxygen in aquariums with hang on back filters and sponge filters and I will also test if and how Oxydator (with hydrogen peroxide) influence these values.
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