Fish At Top Of Tank

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Goliath Tigerfish
MFK Member
Aug 6, 2013
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Hi all. Hope you can help. Last night I purchased 2 fish. I feel better introducing new fish during the ruckus of a water change. I did probably a near 40% wc (tank is a 75gal) and introduced the new fish. I used tap water and some water conditioner/chlorine remover. All seemed fine, even this morning every one looked happy. I fed them about 2 hrs ago and Im noticing the fish hanging out at the top of the tank. Right this second, I don't have a test kit, my last had some old expiration date so I threw it out. Should I start another water change?
 
I wouldn't just yet. Let them settle, look for signs of bullying. Also assuming the tank is cycled?

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Yea, the tank is about a year old. Lots of fish, but zero bullying.

Something I'm wondering about is the chlorine remover. I've had it a really long time. I bought a fairly big jug and I'm just getting down to the bottom of it. Im starting to notice an odor from it, anyone know if this stuff expires? Thanks convict :)
 
Most of them chemicals have a half life and should have a exp date somewhere. This is the first time I'm hearing of introducing new fish while doing a wc. Kind of like sneak them in during the chaos.


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Oh another thing, during the water change, I found out my heater went out, piece of crap topfin, it's not even a year old. So luckily caught that. I got an old heater in now, so the temp is about 5-6 degrees warmer than yesterday.
 
Most of them chemicals have a half life and should have a exp date somewhere. This is the first time I'm hearing of introducing new fish while doing a wc. Kind of like sneak them in during the chaos.


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Any idea how long that is? Cause it's at a few years old.
 
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