Well, while I have been worried about my gf with constipation/sbd one of my ADF that I have had for over a year just died

. I have no idea why and can't see anything specific on him. There is so much good info on gf on this site - does anyone know where I can find info on ADFs? I don't know if there is anything I could have done, should watch out for in his tankmate, if there are meds that can be used on ADFs or anything. If anyone can suggest anything I would appreciate it - thanks.
--sad sea