Tigrinus and iodine poisoning?

[cichlaguapote]

No weight loss at all they eat like normal and then within 24hrs start having problems. Colors are still vibrant. The fish in my tank and store are about 1 year old and they ones in my tank have been with me for the whole year.

I lost a tig similarly but it was much smaller but diet was 100% shrimp for a while. Found it barely breathing and laying on it's side and never recovered. Had a full stomach when he died.

Probably a mere coincidence but for what it's worth.

 

[csx4236]

It's something to do with the shrimp and only wild caught anything farm raised seems to be ok, Both of mine also died with full stomach just bad news i only feed the other silversides and shrimp once a week now.