The Resun CL-85 is only good for tanks 1.5ft or smaller i.e less than 10g. Some discussion here CL-85 Discussion
An alternative for cooling a Nano tank is an Ice Probe but I'm not sure how effective it is. Alternatively, there is a Nanotuners ICA. But be warned, these nano chillers are not very effective.
You can visit this US site for more info on NC and nano chillers: Nano-reef
Lastly, can you PM me the price at which you bought your MH, I am also thinking of getting 1 for my nano
Good Luck, keep us updated on your progress.