I would recommend staying with the oil injection. With actually seeing it, my guess is you have a faulty float sensor in the main (eng) tank. That is the switch that tells the system to refill and the switch that triggers the alarm, neither of witch happened. I am guessing,a gain, that the alarm you heard just before you shut it down was overtemp.parrothead001 (10/22/2007)Going to start my own reef building project with one slightly used, blown up Yamaha 225. Still want you guys to tell me if you recommend premixing to prevent this from happening next time.