no.. drop eyes CAN be prevented. it is very complex and depends on many things,tank is not lake, you cant compare them this way. water level is only an aspect, the light and feeding also. you have to controll everything with care and there are many tricks.
OVERLY high water level is bad to aro especially NEW aro.
drop eyes CAN be cured if not very serious, we did that test before, wrap the tank with black paper or something that light can not penetrate all over.make the tank completely dark, after about half a year or longer, the drop eyes are cured, but if the water, light and other aspects are not improved, drop eyes will relapse in several months after the wraps been removed.