Two heaters instead of one.
I decided to put two heaters in my 75g due to its size. So I bought two Fluval 150w heaters rated for 45g each thinking that makes 90g so I was good. Well they've been heating the tank for 5 days now and its only 72*F when there set on 80*F. I'm guessing I should have gotten bigger heaters correct? What size should I have gotten?
2 x 200w is what I have in my 75g tank. Stays at 78F constant.
What's the ambient room temperature? I would certainly think after five days at maximum output the heaters have raised the temp as high as feasible. I assume you have verified by touch that both are functioning?
Your logic is not flawed, I have the same on my 75gallon. I agree, can you check to see if one of them is malfunctioning? Do you have one at each end?
I have on 3 separate occasions had the only heater in my 75 G tank fail... why is it always on a Sunday night? Nothing open except a Walmart and their biggest heater here is for a 29G.
The exact reason now why I do not trust one heater to run on it's own.
I have to admit it was interesting to watch 6-7 Mollies surround that heater like petals on a flower, huddled together to get warm!!
Also, I've noticed that some heaters come with confusing directions and the setting can be just the opposite of what you would think. It might not hurt to take another look at the owners manual. Been there, done that.
Thanks for all the replies everyone. I turned the dial on the heaters up and now the tank is a constant 78"F. The tank is down in the basement which is a fully furnished living space but still stays at a cooler 68*F ambient temperature. I still feel underpowered with only two 150w despite all the replies saying I should be fine. I may swap them out for something a little bigger.
I had a single 300 watt on my 75 gallon before and it did fine. Though I do have two 200 watts on it now.
It seems to me that the real reason for two heaters is to sustain the tank temperature if/when one heater fails. I have a 200w (original) and a second 250w (added) in my 60g.
Typically, the 250w routinely maintains the temp, but if/when the room temp gets low, both will work to maintain the 76-78F temp. If one was to fail, the other is capable of maintaining temp (unless the room tem was to get very low).
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