i have a 13 foot retic he's been eating fine on f/t guinea pigs,but all of sudden he went off feed. It's been 2 months since he's eaten.He has plenty of heat,humidity is 65 to 70%.He has plenty of space hes in a cage that measures 8ft long 4ft high and 4ft wide.He's really never went off feed like this,but overall he still looks healthy.Please help me.

