I recently purchased 5 fish (blue hippo tang, Desjardin sailfin, bluestreak cleaner wrasse, naso tang and butterfly copperband) from my LFS to replace some that died over that past year from my DT. (200gal system) My QT is 65gal and I put all 5 in there. I actually purchased 4 about 2 weeks ago and 1 this past Friday (copperband). They all seemed to be doing well in the QT and because there is no sump I'm doing regular water changes and keeping up with testing. pH, ammonia, nitrite and nitrate all in check. When the Nitrates start to show up I've been doing 20% water changes in the QT with similar temp water and salinity. (1.023 or so)
I've had problems with aiptasia in my DT so over the past 6 months I've tried to get copperbands in there and also peppermint shrimp. Problems though... 1st...I had (its now been traded in) a snowflake eel that actually attacked and ate the peppermint shrimp. I've also tried twice to introduce a copperband to my DT once with and once without an isolation box. Both times I 've had the copperband killed by an aggressive kole tang. Not sure why it is like that with copperbands, he gets along with all other fish in the tank. Anyway my LFS said while quarantining the new fish put the kole tang in there with the others in the isolation box and since it was in new suroundings he would accept those fish and move them all back to the DT together after the full quarantine.
After 2-3 days of the kole tang in the isolation I let him loose this past weekend and he seemed fine and wasn't bothering the other fish. All 6 kept eating normally and seemed ok. Last night we when we were putting the QT to bed we noticed the blue hippo tang clearly had ich, bunch of white dots on it. I've battled ich once before a few years ago when I got into the hobby and before I had a QT tank. At that time I purchased the QT and saved about 10 of 12 fish using cupramine. I've read since then hyposalinity is less stress on the fish so I started a hyposalinity treatment in the QT. I did several partial water changes from last night to today to lower the salinity, around 1.009 now. After about 24 hours the hippo tang has fewer white spots on it (or so it seems) but also my research has taught me today there is Cryptocaryon (ich) and Amyloodinium. From what I see in demo pics etc they look very similar so I'm not sure what the hippo really has? But I also noticed the kole tang looked more pale than normal last day or so, thought it was maybe a bit of stress moving tanks so didn't think much of it. As of now it looks like it has its skin peeling and as the skin peels his regular colour is beneath? I've read up on that and it sounds like a classic brooklynella. Also, the copperband has now passed.
It didn't show any signs of the ich or what the kole has so that is a strange one. It was the smallest of all the fish it also was the most recent addition and I'm wondering if it was sick or had something from the LFS?
Anyway, i'm at the point where I'm not sure what to do? I've checked over as best as possible all of the other fish in the DT and everyone looks normal. (foxface, 2 clowns, 6 line wrasse, firegobby, tomini tang) I only have one QT so setting up anything else right now would take a while to get purchased/setup. I've read up on Brooklynella and sounds like fresh rodi water dips may help? My primary LFS is closed now and I called a backup place and they didn't have any formalin.
Should I keep the tank at hypo? Should I try dipping the kole tang or any or all of the fish? Raise temp help kill any disease? Good news is I just put in a cube of spirulina brine shrimp and they all seemed to find some and eat it.
I'll see if I can get some hi-res pics added to this post now.
thanks for any help/advice.
I've had problems with aiptasia in my DT so over the past 6 months I've tried to get copperbands in there and also peppermint shrimp. Problems though... 1st...I had (its now been traded in) a snowflake eel that actually attacked and ate the peppermint shrimp. I've also tried twice to introduce a copperband to my DT once with and once without an isolation box. Both times I 've had the copperband killed by an aggressive kole tang. Not sure why it is like that with copperbands, he gets along with all other fish in the tank. Anyway my LFS said while quarantining the new fish put the kole tang in there with the others in the isolation box and since it was in new suroundings he would accept those fish and move them all back to the DT together after the full quarantine.
After 2-3 days of the kole tang in the isolation I let him loose this past weekend and he seemed fine and wasn't bothering the other fish. All 6 kept eating normally and seemed ok. Last night we when we were putting the QT to bed we noticed the blue hippo tang clearly had ich, bunch of white dots on it. I've battled ich once before a few years ago when I got into the hobby and before I had a QT tank. At that time I purchased the QT and saved about 10 of 12 fish using cupramine. I've read since then hyposalinity is less stress on the fish so I started a hyposalinity treatment in the QT. I did several partial water changes from last night to today to lower the salinity, around 1.009 now. After about 24 hours the hippo tang has fewer white spots on it (or so it seems) but also my research has taught me today there is Cryptocaryon (ich) and Amyloodinium. From what I see in demo pics etc they look very similar so I'm not sure what the hippo really has? But I also noticed the kole tang looked more pale than normal last day or so, thought it was maybe a bit of stress moving tanks so didn't think much of it. As of now it looks like it has its skin peeling and as the skin peels his regular colour is beneath? I've read up on that and it sounds like a classic brooklynella. Also, the copperband has now passed.

Anyway, i'm at the point where I'm not sure what to do? I've checked over as best as possible all of the other fish in the DT and everyone looks normal. (foxface, 2 clowns, 6 line wrasse, firegobby, tomini tang) I only have one QT so setting up anything else right now would take a while to get purchased/setup. I've read up on Brooklynella and sounds like fresh rodi water dips may help? My primary LFS is closed now and I called a backup place and they didn't have any formalin.
Should I keep the tank at hypo? Should I try dipping the kole tang or any or all of the fish? Raise temp help kill any disease? Good news is I just put in a cube of spirulina brine shrimp and they all seemed to find some and eat it.
I'll see if I can get some hi-res pics added to this post now.
thanks for any help/advice.