What do you mean instead of him they bought you a new one o.o? You mean they took care of him for you and then got you a new one o.o???
Also I'm so sorry he passed D:!! It's hard losing a baby.
From the middle of the month I knew that he lives his last days... His death wasn't a surprise for me , I gave him a chance eventhough I knew he won't be healthy again. By the way, at the middle of this month his fins which he swims with got smaller and he couldn't move as a normal fish .