This must be stirred vigorously: use a pump with an outflow equal to at least five times, and up to ten times, that of the volume of the aquarium. Do not forget that the water in an invertebrate tank will never be as agitated as in a natural setting. The water must be very clear, to facilitate the penetration of light. It is therefore vital to have good mechanical filtration, possibly in conjunction with an air pump. Invertebrates are extremely sensitive to nitrates (NO3-).

A box filter is indispensable, and its volume must equal at least 10% that of the aquarium.

It must be pointed out, however, that tanks containing true corals, or madreporites, which form reefs can sometimes work well without this type of filter. In order to facilitate the operation and reduce the burden of the filter, thus increasing its efficacy, put the protein skimmer in its first section. As a complement to these techniques, you are strongly advised to perform partial water changes, at a rate of around 10% of the volume, once a week.

It is advisable to change the water the day after the weekly feeding session, as this will help to reduce pollution. The specific gravity of the water must be around 1.024, although it can go up to 1.026.

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