My mother's 4 inch blue cray hasnt been wanting to eat for over a week. He completely ignores any food she gives him, including his favourite thawed peas and bloodworms, and she isnt sure what to do anymore. He's been healthy and active the first 2 months right up until last month. We kept finding him turning himself upside down for a week and was less active during the day. A quick search online said this was to help himself molt, but he never molted. He still remained less active and hidden. While I was out of town last saturday, the tank got a 100% water change after i got a call saying he was "lethargic looking" and curled up in a open corner instead of in his hiding spots. Apparently, immediately after the water change he got ridiculously active, but still refused to eat. He's back to being active in the evening. He didnt stop eating when he had his previous molt, neither did he turn himself upside down randomly. Any idea about what's up with him? Lives in a half full 30gal Filters are; AquaClear 50 hob, a large diy sponge filter with a 100gph pump, and a small riparium basket with pothos and what looks like neanthe bella palm. Weekly 50% water changes. Tank has small pieces of eggshells for calcium. Tankmates: some MTS and a single fat feeder danio he decided to befriend since it swims between his legs and claws without a care in the world. pH: 7.5 Ammonia: 0ppm Nitrite: 0ppm Nitrate: 5.0 ppm His normal diet consists of a mix of Thawed peas, cucumber, zuchini, lettuce, spinach, carrots, homemade wafers and occasional bloodworms and fish. The homemade wafers are usually made out of broccoli, duckweed, white fish, garlic, and any of the veggies above.