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Okay, I'm completely stumped. I have a 60 gallon tank and had 3 puffers in it (lots of plants and rocks)-and they were all fine..eating and swimming around investigating..never bothering each other...then after a week or two one by one they started having this odd behavior. Hovering near the top of the tank or just sitting on the gravel at the bottom. Within 3 weeks all of them were dead. Any ideas? I know they ate-they were like little vacuums with the bloodworms. And none of the other fish ever bothered them?!?!
Help-I want to get more but don't want to watch them all die again.

What type of water were they housed in? Figure 8s need brackish water.

As mentioned above - they should be brackish (SG 1.005 to 1.008ish).

Also, did you feed them any crunchy foods, especially snails? Without crunchy foods, their teeth grow too long and they can't eat anymore...and bloodworms aren't in the crunchy food category (OK food though as long as they get other stuff). Other crunchy foods are rehydrated freeze dried krill, small crayfish, ghost shrimps, cut up people shrimp (uncooked but frozen for 48 hours to kill parasites and then defrosted for feeding).

Also, how clean was your water? They can't deal with nitrites or ammonia at all...

Just some guesses.

Eric

Yes, please test your water & post parameters, so we can help better.