I would think that is a small heater for that much water.

I have a 300W on 100G of water.

big heaters are more prone to fail, I run four 100watt heaters in my 90g with a temp controller, if one fails I probably wouldn't know except my controller tells me the amps so I would know, if more than 1 fails then the temp might start to drop a bit but you would have time to troubleshoot, the odds of all 4 failing at the same time are pretty high.

you're right, it is but I needed a second heater pronto and that was the biggest one the store had (and the only brand) and I hate paying for shipping so I bought it local-ish.

Tank held steady at 78.8F last night which is better than its done for over a month (usually drops to 76-77).

Well that's good- holding is better than what i have.
My heater reads 80 now-86 yesterday:sad: to give me a temp of 76 in tank
So i picked up a second glass thermo this am,
after 5min in the tank one says 76 an the other 82-what the hell!
now what:question::question::question:

ps sorry Christy didn't mean to mow your lawn:wink:

LOL, no worries. I never believe what the heater says, I always have another thermometer and go by that. Once you hit your target temp, turn the heater down till the light goes off and keep an eye on it.

I hear ya but one glass thermo says 80 the second reads 76 one bought today an the first
is a month old, the heater is turned off right now but it did read 80 as well, so do i assume the second thermo that i got today is correct?

LOL, I dunno what to tell you, chuck one of the thermometers and go with the one you keep :razz:

Hahaha, i did figure it out with the help of two more thermos and an infared,
the old thermo was out by 5 degrees so over the course of one day the tank went
from 74-86. Now i just gotta me a better thermo than this $3 mercury one.
Do you use digital, pinpoint, mercury?
Lucky all livestock are ok but it must have been a trip for them.

I use a digital one, got it from jl for ten bucks. Time and temp I think its called or something like that