Disease. Help. Not sure what to do next

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kesh

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Hi..here's what happen..50 gallon FOWLR tank..running around 1 year..everyone's happy and healthy.
2 months ago, i bought a new fish and regretfully dumped the fish together with the bag water in my However, everything seemed okay for about 2 weeks.
Then, an angel started not doing very well. No twitching/ scratching / visible parasite. At first, i presumed it was stung by my foxface. However, it soon started hanging out infront the wavemaker and died few days later.
Then, it was my butterfly's turn. It however was twitching and hanging in front the wavemaker. No visible signs of ick.
So, around 3 weeks after adding the new fish, unsure what i was dealing with, i started dosing seachem paraguard.
The butterfly didnt make it however.
Then my clowns started doing this and one died despite paraguard being dosed a week already.
The other one stopped this behaviour. I though it was responding to the meds but started repeating this behavior again. So i took him out, suspecting its gill flukes, freshwater dip him for about 5 minutes. Upon returning to the tank, he just hover near the bottom. He was eating, looked relieved but two days later was covered with ick and died.
At this point, i was dosing seachem paraguard for about two weeks already but it didnt seemed to be working as the new fish (bicolour) started hanging out in front the wavemaker and died.
So, its been 5 weeks month since i added the new fish and two weeks of seachem paraguard treatment. I was left with my beloved foxface. I did a hypo treatment then (around 1.009), and he seemed to improve alot..he was no longer hanging at the filter output and started swimming around being himself. Appetite increased tremendously. i was still dosing seachem paraguard. His twitching was still there. However, gradually it became minimal to almost none (im not sure whether he still twitches cz even if he does, its prolly once or twice a day and i may have missed it) However, what concerns me is that sometimes it will go hang out infront the wavemaker which makes me think he is still infected. He has no signs of ick. Im been seachem paraguard for a month now. He improved significantly after hypo but i feel its at a point where he is 80% there, but is never going to fully cure. Im worried paraguard and hypo has reached its potential and when i stopped dosing seachem paraguard, whatver he has may just multiply and revert back to his old position. Should i resort to cupramine. paraguard is expensive to keep dosing for long period. Prazipro is not sold at my country. Oxygen levels are also good. All parameters are in check. No ammonia, no no 2, 20 ppm N03. Its definitely related to the new fish since this wasnt my usual go to store and the fish section in this new shop doesnt generally look healthy. Thank you for reading and responding. Cheers
 
Thank you..I would like to clarify something. It seems velvet kills immediately or within few days. However, the tank was running without any medicine for 3 weeks. Could this suggest anything else?

Sometimes velvet kills within a few days, other times it lingers on a little longer before it finally kills. It all depends upon the number of parasites in your aquarium, water volume diluting those parasites, overall health of each fish's natural immune system, etc. If parasite numbers are low and the fish are gradually exposed to them, then some are capable of developing temporary or even permanent immunity. However, these carriers still serve as reservoirs to fuel future outbreaks whenever you add new (non-immune) fish.

So in short, while a quick wipeout is still the "norm" whenever encountering Marine Velvet Disease that doesn't always happen 100% of the time. No two tanks are the same and the variables fueling an outbreak can be different from tank to tank.
 
Sometimes velvet kills within a few days, other times it lingers on a little longer before it finally kills. It all depends upon the number of parasites in your aquarium, water volume diluting those parasites, overall health of each fish's natural immune system, etc. If parasite numbers are low and the fish are gradually exposed to them, then some are capable of developing temporary or even permanent immunity. However, these carriers still serve as reservoirs to fuel future outbreaks whenever you add new (non-immune) fish.

So in short, while a quick wipeout is still the "norm" whenever encountering Marine Velvet Disease that doesn't always happen 100% of the time. No two tanks are the same and the variables fueling an outbreak can be different from tank to tank.
First of all, thank you. I would like to clarify something about velvet lifecycle. I read elsewhere, that velvet can reproduce on the fish itself. Is this true? and if so, would this render medication redudant because the meds cant target the free swimming stage if they are reproducing directly on the fish?
 
First of all, thank you. I would like to clarify something about velvet lifecycle. I read elsewhere, that velvet can reproduce on the fish itself. Is this true? and if so, would this render medication redudant because the meds cant target the free swimming stage if they are reproducing directly on the fish?

The life stage of the parasite that lives on the fish (the trophont) drops off within 4 days to continue it's life cycle. The tomont is the reproductive stage which typically encysts to hard surfaces such as rock, glass, substrate, shells, etc. Theoretically it might be possible for a tomont to adhere to a fish covered with hard scales, or to a seahorse which has a exoskeleton. But to my knowledge, the viability of such a scenario has never been explored.
 
Thank you again..unfortunately, i have to re-setup my tank. Just a quick question, is washing everything (live rock, filter, skimmer, bio-media etc) with chlorinated tap water sufficient to kill the disease or should i use bleach?
 
Thank you again..unfortunately, i have to re-setup my tank. Just a quick question, is washing everything (live rock, filter, skimmer, bio-media etc) with chlorinated tap water sufficient to kill the disease or should i use bleach?

You can dose chlorine @ 60 mg/L to kill everything, including all parasite tomonts. Here is a nice chlorine dosage guide (ppm is the same as mg/L): http://dec.vermont.gov/sites/dec/files/dwgwp/DW/chlorinedosageemergencydisinfection.pdf

Keep in mind it will take a couple of weeks (plus good water movement) for the chlorine to completely evaporate out.

If you choose to break the entire system down and wash everything, I would use diluted chlorine for that application as well.
 

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

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