Please I do need help I"m on to my Third Gaint Bett..the other two went the same way ..I even brought a new Tank ,first thet were very active ..then hardly any movment seemed to be a strain to get the food,I have tested the water ,put a Hot water bottle wrapped in thick towel as it"s winter now  the other two I had during Summer,funny thing the other two went the same way about the same time so PLEASE  help don"t want to lose this one 

Bats