I'm going to chime in here.. yes I'm coming in LATE on the topic but I want to also point out that "Frequent and/or Large Water changes" will NOT cause a cycle. A minimal amount of the beneficial bacteria is actually suspended in the water column. The majority (thank goodness) is living in a bio-film layer on everything within the aquarium including the glass, sand, rock, filters, heater, decorations etc. Truth of the matter is that if you follow solid and safe "Water Change" procedures you can do large (as much as 100% in extreme cases) water changes with little to NO stress on the tank. I think it would be VERY beneficial for people to read this link:
http://www.reefsanctuary.com/forums...7-how-make-safe-water-change-marine-fish.html
Also maybe spend a few minutes on these two:
http://www.reefsanctuary.com/forums...something-cycling-breaking-new-reef-tank.html
http://www.reefsanctuary.com/forums...ners/20945-just-exactly-what-cycled-tank.html
Here is how I "think" I would have addressed the NH3/NH4 problem from the beginning:
A) Get alternate test results (another brand of tests or another test place... friend, LFS etc).
B) Prepare for a hefty water change
C) Add Amquel
D) Retest and re-act accordingly to the above results
Anytime I get a test result out of whack I will immediately re-test just in case it was user error. If I get the same results I will get an alternate test method (Test kits go bad). Then I start taking "action".
Doug it sounds like you're doing things right. Just observe your fish and stay on top of your game. Often times these are mere speed-bumps on the road of Salt Water and will only help you to learn HOW and WHY so that later down the road you will be better prepared to handle such things. It only gets easier and a lot more FUN