Well, most of them anyway. They've been slowly dieing off lately and all I can do is watch helplessly. I started off with about 50 PFR culls from a generous TPT member. Now there are 3-5 that I can see. Apparently they've been dwindling in numbers but I haven't seen any bodies. Its only been recently that I've seen dead ones.
Substrate: small layer (1/2") of PFS
Filtration: sponge filter
Amazon frogbit and a small amount of duckweed
Light is a single fluorescent bulb. Unknown K rating and wattage but the frogbit has huge leaves and I noticed a flower starting to grow.
I've had a population of ramshorn snails, but they have all died as well. I've been doing top offs and water changes with mixes of RO and tap water but not remineralizing the RO.
Parameters last night via API master kit after a water change:
Nitrate: slight reading, but very little
Temp: 75F with no heater. (might be the problem?)
I have a GH and KH test kit on the way. A TDS pen will be on order within the next week or so as soon as more hobby funds become available. I know all the shrimp pros will say those readings are needed before being able to diagnose the problem.
Here in washington we have some of the purest water in the world. My tap has a GH of 0.
Also, the description of them dying one by one slowly indicates a molting problem to me. In a water that is GH 0, they cannot form a new shell after molting. Often they can form enough for 2 molts, but after that, they slowly molt to death.
I was wondering that myself. I couldn't see any shell problems on the dead ones, but that doesn't mean its not there. I thought about putting in a piece of cuttle bone for them to munch on for minerals. Think that might help?