2 months is long enough that you shouldnt have any ammonia. Seeing as how you only have 10 lbs live rock, adding more quality rock will help process ammonia faster.
Also stay on top of waterchanges and use water changes to bring down the levels so the fish are not harmed. My guess is that more liverock will fix the problem.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.