Lost all my shrimp. Help!

[Phlipper]

Hey guys, so I got an infestation of flat worms, been trying to get rid of them but Then my nitrates we’re getting high. I lost both my blood shrimp and then I started doing water changes every 5 days or so. My nitrates have been next to zero but then my peppermint shrimp just died too. I’ve been increasing my Calc to about 400( was 340), my ph is right around 8, ammonia 0 What Would have killed my last shrimp? Oh and I added a melanaris wrasse to hopefully help clean up the flat worms, are they aggressive?

 

[Fishingandreefing]

I have heard wrasse eat or bother shrimps, I could be wrong but I got a six line and I don’t want my cleaner shrimp lol. Also, shrimps are sensitive for any sudden changes.

 

[Uncle99]

Wrasse had lunch, sorry....