I just picked up a 150 and want to get an eheim thermofilter so i'd have less clutter in the tank. The heater is only rated at 210 W but it says the filter is good for up to 158 gallons. I was planning on running the eheim 2128 along side a fluval fx5. I dont think thats enough to heat my 150 especially since its going to be in my garage for a couple of months until the renovations are done in my house. It doesnt get freezing cold here in the bay area but winter is approaching. Do you think i need 2 eheims to properly heat my tank?