Bottom line up front:
3 year old 40 gallon breeder started with 15 males/15 females cherry shrimp. I purchased from SoShrimp and the product was good. This tank's numbers grew in sync with available life cycle information. Hundreds of shrimp in a few months time. They are on the substrate, plants, walls, I mean they are everywhere and always have been presented in roughly a M:F 1:1..ish ratio. This morning I fed the shrimp and my wife commented she didn't see any berried or saddled females. She wasn't only correct, she was absolute. My females, all of them, are gone. I observe, photo, feed, and maintain this tank on an almost daily basis. I thought. The complete removal of the female sex happened slow enough that the male numbers of the colony were able to camoflauge this change/symptom happening until today.
Over the course of today I haven't been able to locate a single female. I could accept a weak visual male-to-female ratio but 100% male. No. Something is wrong. And, most likely has been for some time considering it was able to tear through my entire population with an unnoticeable die off rate. I'll provide as much initial data as I can continue to post new information as ground is lost or gained. But, I'm baffled. I understand the discussions we are going to have about my parameters. I know. I'm going to slowly dial these numbers in to native parameters. But, this is sex-specific. Female only. One would assume that any parameter issue would declare itself against both sexes?
Low-tech: Lighting 2 x aquasky.
bi-weekly 10% water change
Substrate: Potting soil capped w/ black flourite. Plants (heavily) - Sagittaria Subulata, Rotala Rotundifolia, Limnophila Aromatica, Java fern.
Gh: 180+ scale topped
The diet: Everything and fed daily -
API Bottom Feeder pellets
Aqueon Cichlid Pellets
Hikari Tropical algae wafers
Marineland shrimp wafers
I don't know if permissions are added as activity increases but I currently can't provide attachments but it says that IMG code is on. So I wonder if I can....
If those tags don't work I'm sorry. I look forward to hearing what is said and I look forward to hearing your expertise.