1. filtering materials: at present, the common aquarium filtering systems mainly include upward filtration, trickle filtration, bottom filtration, barrel filtration, side filtration and reverse filtration. These filtration systems have different forms, but they are essentially the same. They are all filtration systems that cultivate nitrifying bacteria outside the tank. In other words, the fish must be extracted into those filters for nitrification, and the ammonia in the fish manure can be removed.

General filter materials are: filter cotton, biochemical cotton, activated carbon, glass ring. Generally, volcanic rocks or coral sand are laid on the lower tank. Luohan pearls (including Jintai) prefer weak alkaline water. Coral sand is the best bottom sand, so the PH value is between 7.2 and 7.6, and the thickness of bottom sand is recommended to be above 2 cm. However, Lohan Jinhua (excluding those with obvious pearl lineage) prefers weakly acidic water, and it is best to use volcanic rocks or bloodstone as bottom sand to keep the PH between 6.5 and 7.0.

2. Ornaments: First of all, the fish tank is preferably above 20 cm, because the arhat fish is relatively large, and a larger fish tank is conducive to growth. Don't leave mountains and other beautification things in the scenery, because Lohan will rub the jar when playing, which will cause harm to the fish. Pink water lamps can be placed in the tank. If there are two arhats, there is a partition in the middle, because arhat fish belongs to medium and large cichlid fish. Strong territorial concept, it is suggested that single-cylinder feeding is appropriate.

From 65438 to 0996, aquarium lovers in Malaysia cultivated a brand-new fish species-"Lohan" through continuous cross breeding, which triggered the breeding boom of Lohan fish. It swept the whole Asia-Pacific region in an instant, and fish fans in Singapore, Japan, Taiwan Province Province and other places snapped up one after another, causing an uproar in the aquarium industry. The Chinese name of arhat fish is colorful snapper, which means colorful cichlids, also known as arhat.

In addition to the majestic king's imposing manner, dazzling and moving colors and humanized and lovely appearance, Lohan's fans are most addicted to the emotional bond between them and their owners.

Lohan is fierce to other fish, but very spiritual to people. As long as the owner comes to the fish tank, Lohan will swim up and play with the owner. Or swim back, or turn over, or lie in the master's hand and enjoy his caress. As gentle and lovely as cats and dogs. However, if a stranger wants to be so close to Lohan and play with him, he will attack him mercilessly, from leaving a mouth mark to bleeding. No wonder many families keep arhats as pets.