I shouldn't think the temp is a problem - I always run my Nova vertical paper tanks at around 23C and the developer (usually Neutol WA) lasts for many weeks. I have read somewhere on APUG someone mentioning that their Ilford warmtone had a green tint and that a dip in selenium toner fixed that, but I've not noticed it myself - I always get a very warm result in Neutol WA.

I do use other papers such as standard MGIV and Agfa in the Neutol WA without noticeable incident, but that may just be me not looking closely enough...

Bob.