Black shell shrimp has super algae removal ability. In addition to filamentous algae, use a big-eyed thief, but be careful that it attacks fish. The egg holding period of black shell shrimp is about 20 days, and the color of shrimp eggs can range from dark green to grayish white. Newborn shrimps are 2 ~ 3 millinewtons long, transparent, with stalks and movable eyes. The first and second legs are pincers, and the five pairs of legs have no outer limbs. Abdominal limb intact, tail round tongue, no tail limb.