1, 4 square meters, egg score BMQQ or egg score of the same level (about 2) is used to remove useless things in water, such as granular debris, nutrients harmful to organisms, etc., the circulating pump flow is about 6L/H (about 5), the heating rod is about 2W, and one wave-making is about 3. (Wave-making is to create underwater current, turbulence. In the lower slow-flow area, the main lamp chooses a lot of Maiguang 6W (around 1 yuan) with a light accumulation of 172 yuan (more than 2 yuan). Needless to say, the main lamp is used for viewing, simulating natural light to provide a light source for corals to ingest zooxanthellae. A timing socket can make waves up and automatically turn them off at night. (provide rest and slow flow for living things at night)

For other necessities, choose your own brand of sea salt, and buy any optical salinity meter, such as PH, NO3 testing agent and fish food. 2-5 live stones. Just do it.

suggestion: if you haven't raised fish, don't raise corals first. The 4-tank belongs to a small tank, and it's ok to raise a few small fish in a small tank. Coral raising is not easy, and you are still a novice. I suggest that you raise LPS and the list on LPS. You can buy cheaper lamps, replace the NO3 tester with NO2 tester, and buy more nitrifying bacteria in seawater. You can decide which nitrifying bacteria to buy.