Unfortunately,you just described the burden of being a rat owner,they are not down here for long,compared to us and we do have to keep topping up the numbers for the sake of those rats that remain.So you need to ask yourself,do you want to carry on cohabiting with rats?If so,I would try and get a pair of young sisters as soon as possible.If you have at least 3 then you will not be left with a lone rat.I am sorry for you and Tias loss of Fllorian.Beautiful names💕🐁