Lysimachia nummularis help needed

[JMLenke]

Yeah may do that.

Trying to figure out what happened yesterday to my 55. Did a water change like normal, moved driftwood and such around and every catfish(6 year old Syno Ocifeller, 2 unknown sp. Syno, 1 almost 10 year old Striped Rapheal) in the tank is either dead or dieing, the rainbows are all fine though. Tested with every test kit I have and nothing is out of the ordinary. Did a 40% change to try to remove whatever issue there was and did another full test this morning, no idea what is going on.

[SCMurphy]

Cloramines??

[JMLenke]

Amquel + takes that issue out. Came home to the Raph and one syno bricked and the other 2 synos are 50/50. Also lost a Salmon Red rainbow. Whatever it is, it has killed all of the weakest fish off.

Smallest fish and the youngest (juvenile Albino Bushynose Plec) are fine.

[Cristy Keister]

Could have been some anaerobic areas under the driftwood you moved, releasing hydrogen sulfide, which is toxic.

[JMLenke]

I thought of that, I wonder if it was that as I redid the entire tank about a month ago. I left the canister alone to save some of the bacteria but almost all of the substrate and interior was changed/remodeled.

Oh well, Ill save what I can and make do I guess.