i have recently started a marine fish tank, it holds 190 litres, i have live rock and sand in my tank. in the first 2 weeks it was empty until a crab the size of a £2 coin came out of the rock also 3 very tiny crabs but the tiny crabs were dead but the big crab named oscar was doing very well. a few week’s later we checked the ph and everything was perfect so we added 2 cleaner shrimp, 5 snails and 2 hermit crabs. another 2 weeks later we checked the levels again and everything was great so we added 2 fire shrimp, 2 black and white clown fish and an anemone, on saturday i noticed the cleaner shrimp were excited when i took a closer look i seen they had one of the red leg hermit crabs and they shredded him apart limb from limb, then on monday i seen some excitement with the fire shrimp and i watched in horror as they pulled the top shell off of the big crab oscar and killed him. i cant seem to find any information about shrimps killing other animals in the tank and i wondered if anyone else has experienced this or if anyone knows why it has happened.
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