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Discussion Starter #1
I have my Betta in a 3.5 gallon tank. I just got him today but was unable to get a heater. Im almost certain his tank is a bit too chilly so Im getting the heater tomorrow. My question is, since he's already in his tank right now how should I heat it once I get the heater? Do I take him out and house him in a cup until the tank is heated then put him back in or do I just leave him in the tank while it's heating?

Sorry if this is in the wrong place.
 

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Place the heater in the tank, let it sit for a few mins make sure the heater is set to the current temp of the tank. Plug it in. Then ever few hours raise the temp about 2 degrees. Ensure the temp if the tank is what you raised it to before raising it more. Once you get to the desired temp leave it be.
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Discussion Starter #4 (Edited)
I ended up getting a tetra submersible heater for 2-15 gallons. My thermometer says my tank temperature is 66 degrees, freezing I know. The heater is supposed to automatically shut off at 78 degrees but will shut itself off at 70-72. I have called the customer support and am receiving a new heater by mail in a week or so. I am just wondering, is there something I am doing wrong? I've had the heater vertical, horizontal, half way; but it won't heat past 72 degrees. It's non-adjustable.
 

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Those heaters aren't very good. I have two. They don't actually get to 78 degrees at least mine never did. I had to buy an adjustable one. You aren't doing anything wrong it is just the heater.
 

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I would run the heater for 24hours in similar size container with in tank thermometer to make sure it will actually keep a stable temperature between 78-80F. If you determine it to be working he needs to be acclimated to the newer water slowly. Since this is non adjustable he will need to be cupped while the tank heats, then floated in the cup for an hour in the fully heated tank.
 
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