Hi cyclist,
I feel your pain. I have a JBJ nano cube as well. Here in the forum, I chronicled my issues with a leak in a back compartment. I purchased on line yet worked with JBJ to rectify the situation. Their customer service is lacking. They did replace the leaky aquarium - I had to remove everything (pumps, lid/lights, and so forth in setting up the replacement.
With optimism, I am happy with the replacement aquarium and hope there are no other issues. Hang in there. Quickly, I found out that this hobby is my 'crack'!