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I see the 2 shrimplets, very exciting and the shrimp in the photo look very healthy! The KH is fine at 3 and slowly dropping because of the substrate, but still in the acceptable range. Not sure about your tank size, other than 'nano' but if you have fish in that same tank (I think I see one in the photo blrred and at the back) I would do 25% weekly water changes (mainly because of the fish) and that will help counter the substrate as well, until the substrate is 'exhausted' of its buffering ability. Use the same kh4 new water as currently and always add the new water slowly, a drip method is best. Obviously you will need to be extra careful when removing the old water that you don't remove any of the new shrimplets........ Try not to change too much though as you may do more harm than good and it looks like everything is actually already going well, visible mating behavour and shrimplets doing well. Hope you manage to get rid of the planaria and that usually involves sizeable water changes in the process so complete that first and from then do the 25% regular water change routine. As the population grows you will need to increase the amount of food but be cautious not to overfeed. The bacter AE should help with biofilm growth etc but it isn't actually a food for the shrimps, though you may see them eating some if it isn't dissolved fully. The scuds are harmless and I would (and did in the past) remove them manually when you see them.

I cannot see anything wrong with your shrimps. KH at 3 is fine for Neos. But why are you fighting the substrate by adding water with more KH? Fluval Bios stratum has a tendancy for slightly acidic water. Which means lower KH. I quote from Fluval website : "+ helps support a neutral to slightly acidic pH - ideal for live plants as well as tropical fish and shrimp commonly kept in planted aquariums + softens water naturally, reducing carbonate hardness" . If you want KH to stabilise at 3 or 4, some crushed coral is a good idea. I add some in my tanks in an old pantyhose, and bury it in the substrate so it cannot be seen.

Thanks for your feedback. I am coming back because I am uncertain on what I should do. There are some good and bad news. Bad news is that since last post, I think I lost one more shrimp. I see only 4 of them. Also I discovered some planarian. I just started the no planarian treatment yesterday. I have scuds too, I could get some but the remaining are now much more cautious and hide. Not sure what to do with it. The kh is very low, slightly under 3. I add water at 4kh but somehow it doesn’t evolve. I don’t want to introduce water too different since it s a nano and evthg can go so fast. I have the fluval bio stratum. I was thinking to add some crushed coral but I don’t have place in filter nor want to add it on the dark substract. On the positive side, the berried female is giving birth and I have seen at least 4 shrimplets. She still carries eggs. I put a picture of an adult and 2 shrimplets, can u see them? Finally this morning, I saw a male going crazy and actually mating the other female. Does it means that there are not so unhappy after all? Their behavior seem much more normal since last time. I barely feed them since they never eated my hikari shrimp cuisine but yesterday I did a test and they eated it. (Not the scuds) So I plan to feed them more regularly. I also bought bacter AE. Fishes go well