Convict tang

Hey there, my tank issues continue. OR, I'm paranoid.

My corals remain extremely healthy, I did a while back have a hammer die of brown jelly after being damaged.

Here's my question, what causes corals to remain healthy and only some fish to get sick?

It does NOT look like ICH, actually it doesn't look like anything. Thompson my clown died, we though he had a bacterial infection, dipped him in Lugols a few times, he did better then just disappeared.

We waited a few weeks, dosed the tank for those weeks with Lugols, no other fish got sick or died.

We then bought a pair of ocellaris clowns, acclimated, then one died and the other appears to be healthy. Now one of my Chromis is missing, and my Convict tang "Leland" although looking healthy has a small spot on his side.

Here is my params.

Salinity: 1.024-5
Nitrates always test super high on my kit but good at my LfS- i need a new kit but mine says-20-40ppm
Nitrites-0ppm
Ammonia-0ppm
Ph- was 8.0, I added a buffer, it's 8.3 now

Temp is 78-80 degree I can't tell

I am out of ca test
Will have it checked today and buy a new one.

We run our lights from 3pm to 11 pm(no clue at what) the light is a ocean revive.

I feed phytofeast every other day
Omega one super veggie flakes 1x daily
Everyone in a while put a veggie strip in for my tangs, they don't seem to like them very much.

I also target feed many of my corals with Piscene Mysis every 2-3 days.

We do 20-25% water changes weekly.

It's a 92 gallon bowfront with
a 20 gallon sump, a "something" octoprotien skimmer.

Here is my livestock and coral list-
2 green chromis
1 convict tang
Clown tang
1 large tomato clown that's moving out today (he's mean)
1 fire fish
1 ocellaris clowns
1 dragonet
1 warpaint goby
1 eb blueclaw crab
1 emerald crab

1 torchEuphyllia glabresens
2 finger leather Sinularia notanda
2 separate heads candy cane
Green button polyps
Red bubble tip anemone
Green tip anemone
Bubble coral plerogyra sinuosa
Acan Acanthastrea echinata
Open brain coral Trachyphyllia geoffroyi
Duncan Duncanopsammia axifuga
Hairy mushroom Rhodactis indosinensis
Mushroom Corallimorphs
Pineapple coral Blasto Blastomussa merleti
Green hammer coral Euphyllia fimbriata
Zoas-Parazoanthus axinellae
2 watermelon
Eagle eye Zoas

Below is a picture of my tang. Maybe the spot is nothing.

 

Clown Tangs need a large tank (250+ gallons) and generally don't tolerate other Tanks.Convict tangs also need a large tank (125+). It could be a wound could be nothing. Every time you add a fish to the tank you run the risk of introducing pathogens.Also since these fish come from different regions the fish in your system may have no natural immunity because they have never been exposed to particular strains before.Stress is the enemy to a healthy system. The more fish you add the more stress you are adding. It is best not to constantly add things for these reasons especially if you are not quarantining.

 

What is an eb blue claw crab??

 

Yes

 

Oh guess I should read before I answer. here a picture of one. Mine looks like this but I can't find him to take a pic.

 

Got you.Electric blue leg hermit. You had me worried as a blue claw crab is a voracious predator.lol

 

And a tasty meal

 

Absolutely! Lol

 

Well crap, they told me he's a EB blue knuckle crab and he was the same as most crabs and opportunistic. When I looked him up, that's the picture I found and it reflected the LFS opinion. Now, I am going to find him a get a good luck and potentially banish him.