I can agree to that testing and too much playing around to fix something could be bad. Looks can be deceiving though. I guess it would depend on what is going on. I would try to fix it if I could, or at least test again in 4 - 8 hours to see if its resolving itself. It would get me to start looking for a problem like you said. You see example I gave in another thread 82 snails dead. That was at .5mg levels and less. Well long story short nitrite was the problem, fixed it, and every thing is ok now. I see similar instances on here where urchins slow, snails dying. I suspect nitrite problem. I suppose for some it maybe hard to id a problem. The best thing I can suggest would be for people to educate themselves on things that could be a problem, and yes fix if possible.Would you do something different - if everything in the tank looks good?