Dechlorinators tend to smell eggy at the best of times, so I'd be inclined not to suspect expiry; could be though.
In regards to the water change and introducing fish, I've never tried it; I've found the best way is to move the ornaments and just reset all territories.
I think the likeliest issue here is the heating. You may find that once it settles to a stable level, your fish will behave normally.
Sent from my Nexus 5 using MonsterAquariaNetwork App
In regards to the water change and introducing fish, I've never tried it; I've found the best way is to move the ornaments and just reset all territories.
I think the likeliest issue here is the heating. You may find that once it settles to a stable level, your fish will behave normally.
Sent from my Nexus 5 using MonsterAquariaNetwork App