I have an outdoor above ground pond for a 20 inch Arowana I recently got he jumped during transferring tanks and hurt his eye, confirmed drop eye from other thread. I currently have him in my 140 gallon tank with my oscars but thats till I can get the pond heated. I have 3 heaters for theyre each for about 35-40 gallons, would it be safe to put all three in to heat the about 200 gallon or so?