Tuner - I Run 1 - 55gal barrel non heated with Air then my real barrel - 55gal - Heated to temp with air ....and rotate ...Works awesome so far(A bit overkill but my water has Chlorine and chloramine out the ying yang....Ph is ok at about 7.1) but i pump it full of air and Use Prime to try keeping it to the stress min... havent lost a fish yet...- That probably is in part due to Rick From CAF has awesome fish tho haha