Its always a good idea to have more than one heater ,they do fail i have 3 stealths on my 240g same deal with filters. Hows the aro any change, have you tried increasing the oxygen with a air pump?
you saying do this so i dont have to aclimate?Drain it to 50% and start slowly filling it with water from the 90
by the time it's full the parameters should be close enough (as long as the temp is too)

midnight;1370048; said:is that to change temp or not to have to aclimate?lol
i have pumps but dont have long hose unless a garden hose would hook up to a pump