Sluggish betta fish

[ScuitoAmi150]

I have two bettas Scuito (male. bought him September 2008, full grown) and Ami (female. Bought her April 2009, she was not full grown) they live in a divided tank. I got Ami around April when my last female Cheshire died. Not sure why she died. ='[
Two months ago Scuito had velvet and became very sluggish. So I took Ami out for a little while and put some medication in the tank (I don't remember what it was called). It went away so I put her back in that tank.
Now BOTH of them are sluggish!!! =[ Scuito just sleeps on the bottom of the tank. Ami sleeps in the corner at the top of the water. I was SO scared this morning. I put her food in her side and she didn't move. I taped on the glass and she STILL didn't move. She started swimming around and ate her food after a minute.
I'm really worried. Why are they both sluggish? Scuito doesn't appear to have velvet again.

[Romad]

The first thing I though of was temperature. Are they in a heated, filtered tank? Bettas need warm temps. to thrive.

What size tank? How often do you change the water/vacuum the gravel.

And what are your ammonia, nitrite, nitrate, ph levels?

[ScuitoAmi150]

I'm not sure what the temperature is. I'll put the thermometer in the tank when I get home (they both attack it if I leave it in). It isn't heated but should be at least 70.

i don't have a thing to test the ph levels

[New2Betas]

The tank should be 75-80* (give or take a few degrees). Even if your house is 70* that does not mean that your fish tank will be too, it may be a little lower then that.

I'm hoping someone else can help more, best of luck to you and your fishes.

[ScuitoAmi150]

their tank is a few degrees less than 70. Any idea how to heat it up? It's a plastic tank so I don't think I can get a tiny heater, not sure.

I have to keep the tank high up on my dresser, out of the reach of the cats, so not sure how well adding cords will be.

[New2Betas]

How small is the tank? They make small heater for tanks. I bought this one its for 2-5 gallons

http://www.petco.com/product/102429/...:referralID=NA

[ScuitoAmi150]

My tank it half gallon I'd say. Is that heater too big for my tank?
my tank is plastic

[ScuitoAmi150]

http://www.petco.com/product/110575/...a%20Kit-110575 that is the tank I'd like. You can put it back to back (or so it looks), I just need to figure out space for it.

[vaygirl]

Do you mean you have two bettas in a half gallon tank? That's really too small for just one betta. If you can, I'd get them a bigger tank with a heater and they'll likely perk up. A heater is essential. For two you really should have a 5 gallon divided. How often is their water changed in their tank now?

[ScuitoAmi150]

I'm looking at getting a 5liter for each, so they can each have their own. Their water is changed every 3 days. Give or take a day depending on how it looks