Help! Fish dying one by one.

[bamadws56]

I am having trouble with my fish slowly dying, one by one, over several weeks. I think it's a husbandry issue and would like to get some advice. I currently have:

1x foxface
2x clowns
1x six line
1x flame hawk
1x blue damsel
1x yellow tail damsel

Dead:
1x firefish
1x sailfin tang
1x tail spot blenny (he was fine yesterday)
2x royal grammas

Thoughts? The grammas were the only things that I could see that had been obviously getting chewed on prior to their demise. The sailfin and blenny were literally fine and eating heartily the day before they showed up dead.



Sent from my VS985 4G using Tapatalk

[ZOAREEFTANK]

How big is the tank? What are your parameters?


Sent from my iPhone using Tapatalk

[bamadws56]

75 gallons. Parameters:
0 amonia
0 nitrite
Almost 0 nitrate (not the color of zero, but not as dark as the first next line)
Dkh 8.8
Cal 420
Mag 1350
Ph 7.9
Temp 79

Sent from my VS985 4G using Tapatalk

[Timfish]

Couple questions, how long are the fish living in your system before they die? What are you doing for QT? How old is your system? Did you have several fish that were doing well and then the addition of one started the string of deaths?

[bamadws56]

Tank is over a year old. 6 week QT. Kind of the opposite, I have the clowns and damsels, then starting adding new fish, they were the ones who started dying. Foxface is the next senior member. He seems fine. Its the newer fish that die. But not after they have been in the system for a month or more.

Sent from my VS985 4G using Tapatalk

[bamadws56]

I think the damsels might be the ones harrassing the new fish. O had seen them chasing the grammas. But, I did think the blue persuasions were fairly peaceful.

Sent from my VS985 4G using Tapatalk

[Timfish]

Well, not having any external signs of parasites I'm still going to guess you introduced a parasite on a rock or coral (cysts can be transferred on any hard substrate). Your established fish have built up a resistance to it but newer fish, between being more susceptable and the stress of having to deal with established fish are not able to deal with it. At this point without having a firm idea of, or whether you even have a pathogen/parasite it seems the next step would be to try to determine if you do.

Do you use water from your DT in your QT? If you do that rules out anything that is transferred in water. If not that might be an experiment to try.

[bamadws56]

I don't use DT water in the QT. Any suggestion on what I should watch for pathogen wise? I know what Ich and marine velvet looks like. I'm not sure what to watch for outside of that.

Sent from my VS985 4G using Tapatalk

[Sk8r]

The sailfin and the rabbit both needed a larger tank, for one. That can cause stress and aggression and touch off response in others. Did you notice red spots on any dead ones? That can be rabbit-strike. You also don't give clown species: reds and clarkiis are more territory hungry than others.

[billygoat2000]

Fish dying at night? You probably have too much salt in your tank.