Hi, I need your help please. I lost 4 shrimp overnight after introducing fauna (including those that I lost) into my cycled tank yesterday.
-Introduced 6 threadfin rainbows, 10 pygmy cory cats, and 6 cherry red shrimp into my new but cycled tank last night. This morning, 4 shrimp are dead. Readings are 0 ammonia, 0 nitrite, 5 nitrate but the nitrite looks faintly purple. Temp is 78F, tank is lightly planted with Eco Complete substrate, filter is Fluval 305 stuffed with biomedia and set at half flow with the lever. I am in Eastern WA if that helps. I use tap water dechlorinated with API + Stress Coat. I have a new bottle of Tetra Safe Start available too.
I have waited for weeks to finish my cycle on my 27 gallon tank and it finally finished earlier in the week! I did the 24 hour test - after I believed it was cycled, I added ammonia to ensure the tank could process it. Everything looked good (0 ammonia, 0 nitrite, lots of nitrate).
Friday afternoon I did an 80% water change in preparation for picking my fish up Saturday afternoon (I read to do this here to stabilize water parameters).
Fauna: 6 threadfin rainbows, 10 pygmy corydoras, 6 cherry shrimp (an extra hitched a ride), and an unexpected assassin snail.
I acclimated over half an hour by floating the bags in my tank and adding tank water every 5 minutes. The threadfins were bagged by themselves and everyone else was in a second bag.
I kept the lights off and released everyone but the assassin snail into the tank once acclimation was complete. I have read here that the assassin snails can sometimes attack shrimp so I changed out his water and kept him floating in the bag until I could figure out what to do with him.
I watched everyone for hours afterwards (by the ambient light outside of the tank, I kept the tank lights off) and they happily explored, the shrimp started grazing and finding whatever interests shrimp in the substrate. The assassin hung out in the bag and explored it.
I woke up this morning and there were two shrimp bodies up front - a big one which had turned a milky light red and a little one who was a little milky but not as much. I found another body under the cyperus helferni, and another big red shrimp that was not milky looking on top of the cyperus helferni. I could not find the other two but assumed they had died and were under the driftwood caves.
I am so upset, I love these little guys and I am also worried about my survivors.
I fished out the bodies and tested my water - 0 ammonia, 0-ish nitrite, and 5 nitrate. I say 0-ish nitrite because it was closest to the 0 blue on the master API liquid test kit, but it wasn't the blue blue that it had been before.
What do I do?
I don't know what to do
About 30 minutes ago I found the other two cherry shrimp - they are alive but near the water line on the intake and out take pipes of my tank. I put the assassin snail in when I thought all of the shrimp were dead and he is also on the water line.
The corys look good - they are actively exploring the substrate and resting amongst the plants. They surface to the water line for air a bit more than the big corys I have had in the past but they don't appear distressed.
The threadfins are all at the surface of the water - are they searching for food? They come down a couple inches for a few minutes then back to the surface.
I have tetra safe start - should I add the bottle? I lowered the water level by a couple gallons and put in an air stone to break up the surface water a bit as I noticed it looked a little stagnant, it did not significantly increase flow and the fish don't seem to mind it.
My gut says to do a water change but then I would not be able to add Safe Start for 24 hours ... and I have also read that using hot water out of the pipe (to match the tank temperature of 78F) can introduce more copper into the water and kill the shrimp.