The most difficult thing regarding marine tanks is the water filtration. It is not enough to filtrate excrements from the water, you also need a kind of sterilisation. The most suitable types of saltwater filtration is the UV filtration, ozone filtration and the protein skimmer. The UV and the ozone filtration must be be used carefully because they may filter the water too fairly and could result in more harm than profit. For instance, killing too much bacteria so the fish will lose their natural immunity and also the bacteria eliminates nitrates, so that you can lose a natural way of filtration - biological filtration which is just another effective way of cleaning the water. These bacteria live in the substrate so selecting the substrate is very important because bacteria are the cheapest and the most natural way how to keep the water of quality high. You may buy a filter with an aerator, or you can buy the aerator as an standalone product. The aerator has to have a reverse valve so the water will not damage the machine. Also the aerator stone doesn't have to be grain, because the salt use to choke up. It is very important for two things; The first is that fish need a lot of air in the water and the second one is that there must exist a water stream.
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