I have a 120 g tank and one out of my two heaters failed last night I wrapped my tanks in blankets as it was cold here in Ontario it stayed at 76f to 70f so I didn't get much sleep. I bought two new heater at the nearest place by me as the city is 2/3 hours from me so I went to a local Walmart Supercentre but it doesn't say if it's for salt or freash water
I bought two of these as they are the same size as my old one 55 g but they are much shorter will these still work?

I bought two of these as they are the same size as my old one 55 g but they are much shorter will these still work?

