My pH has been at 8.5 and ammonia between 0.1-0.3 for the last 2 weeks. I have done regular water changes during this time and both remain the same. The fish, corals and inverts seem to be doing just fine. What might else i do either then cleans and water changes? Any ideas what is causing this? I have had 3 asteria snails die from falling off a rock then my crabs eat it clean so i did not bother taking them out because they were eaten clean.