Gill Passman wrote:
The Nano is up to 88F.

That's too hot. I think 85-86 would be the extreme upper end. They can
handle 90, but any short power failure would suffocate them.

Can you position the nano close to the big tank and have them use the
same sump?

There are also reasonable chillers for nanos:
http://www.marinedepot.com/ps/ps_Vie...ct~CW1111.html

--Kurt