Fish losses - why?

ThunderGoose

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Six weeks ago a new fish (ORA Pygmy filefish) disappeared. I had lost a previous one when it swam into a powerhead and this one was really small so I assumed that's what happened to her.

About a month ago my blue-green chromis quit eating. I noticed some stringy, white poop and I pulled her out and put her in the hospital. I treated with Prazipro but she died two days later. I didn't open up the chromis but on the exterior she had no discolorations and her body condition looked good.

Within a week I also lost a Royal Gramma who had shown no signs of disease (never saw the body, she just didn't "show up" for dinner one night).

My tank is 2.5 years old, I haven't had any issues with corals or invertebrates. I haven't checked the nitrogen containing compounds but I have an auto-water change system set up that changes about 1.5% of the water daily so I'd be really, really surprised if they were off.

pH runs between 7.8 and 8.1 (daily); temperature between 77.9 and 79.1.

I do have a hitchhiking mantis shrimp (a puncher, not a stabber) that I've only seen a few times but I still hear the snapping occasionally.

My remaining fish are a neon goby, a yellow assessor and two Ocellaris clowns who all look fine.

So now what? Treat the DT for parasites? I have a lot of interesting invertebrates that I am very fond of and I don't want to accidentally kill any of them.

Pull the fish and treat them in a second round of QT? (yes, I QT my fish - treating with copper and Praziopro)

Wait and see and keep my fingers crossed? Since I don't know what happened, how will I know it's safe to replace the lost fishes?

***Bangs head on desk***
 
White-stringy poop is usually intestinal parasites. Doesn’t kill quickly all the time, but can kill if it gets severe, or causes secondary internal infections.

I’d treat all the fish with General cure (or metroplex) + focus soaked foods for 10-14 days, or as long as three weeks if needed (if you see more stringy poop).

Run carbon, turn off flow, feed small amounts at a time so it’s nearly all consumed (don’t want a lot of leftovers in the water column)

It’s fairly Reef-safe if you are careful. I’ve done it without issues.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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