Help! Cardinal Tetra Die-Off
I wanted to know if 4 of 37 die-off is typical for Cardinal Tetras by the 2nd day?
Started my tank with some planting mix that I had to remove weeks before I got any fish, now it’s just eco-complete. I don’t think there’s any residual material. After that, I conducted a no-fish ammonia cycle that took about 4 weeks to establish.
I added 6 otocinclus catfish and have repeatedly been seeing 5; I added 10 Amano shrimp and now am repeatedly seeing 3. They have been in the tank for about a month.
I now added 37 cardinal tetras, drip acclimated for over 1 hour to bag in the tank, dark overnight, fed the next day after 24 hours with the same tetra flakes they were getting at the LFS. Most ate, that I could see. The bottom half on some tetras aren’t bright red as I am used to typically seeing.
LFS pH was 7.0
The Cardinal Tetras all hang out in the back corner (near the filter return) with one or two swimming out occasionally.
The two filters and the CO2 Jebo create quite a bit of flow across the front of the tank.
Any ideas about die-off, path forward?
I have kept 10 rummy-nose tetras in the past and didn’t lose a one in 6 years!
54 gallon corner bowfront
103 watts T5HO
Eheim 2217 their media
Magnum 350 (with Purigen)
Pressurized Co2 30(?) Lime Green Thru a
Jebo Filter as a diffuser
Temp - 76 degrees F (Lowered for Amano)
Amm - 0
Ni - 0
Na - 5ppm (currently using Purigen)
PH - 6.6
RO water from store machine
Substrate - Eco-complete
Mixed Fert alternate days in a week:
KNO3 x 3 KH2PO4 x 3 K2SO4 x 3 CSM+B x 3
Manzanita with Java Moss
Mayaca Fluviatilis and Sellowiana
Some external pothos have roots that drop in the top