Purple harlequin rasbora no color and being picked on

We've had the 10 rasboras for roughly 2 weeks now.
A few days after we got them they were all settle in and happy. Their colors were all bright and vibrant.
My honey gourami got used to them and they're all one big happy family.
This morning I turned on the light and was doing a head count and checking them out while I was feeding them.
Well one of them had lost most of it's color. Its one of the larger ones.
Once they got done eating, half of the rasboras started chasing it and trying to pick at it.
At first I thought it was just playing, it's fins are in perfect condition however after a few minutes we decided to move it to the 5 gallon(this is just temporary for it until this gets sorted out). It had at that point lost almost all of its color.
I see no signs other than loss of color. It was eating just fine.
To me it seems stressed because it's being chased non stop.
Why are they picking on it?

Did a 30% water change on Wednesday. I am doing one again today.
Ammonia 0
Nitrites 0
Nitrates 10
Ph 7.9ish

He moves so quickly it's hard to get a picture. I will keep trying though, it's just a big blur. Lol
I shut off the lights on the 15 gallon to calm those guys down.
My husband said he saw them pinning it to the side of the filter just before he pulled it out of there... Bizarre...

 

Something to remember, fish tend to pick on sick fish to get rid of them.

 

Not the best picture by far.
After a few minutes in the smaller tank it's gotten a lot of color back.
I just don't get why this one was being picked on.

 

Maybe they just don't like him/her aha. But if he/she is swimming fine it should be good for now. When fish get put into a tank they usually lose colour from stress. Usually fish regain colour after a day or two when they comfortable in the tank.

 

I understand it takes time for fish to settle in.
My problem is everyone was settled in and now a problem has arose with one fish in particular.
So if the only signs are stress and he is being picked on...
What could it be?
Is there a medication I can get that would be a good all around medication that may fix his underlyI g issue?
That is if he is sick at all...
I don't want to keep the fish in the 5 gallon for more than a day... I only put him in there because it looked to me that if they kept going after it and we didn't intervene then it'd die.

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If the fish are picking on him maybe they're just not compatible. If the fish is doing fine alone you have no reason to assume illness. You'll just be trying to find something wrong with him, when maybe there's nothing at all wrong!

 

I would keep the little guy in the hospital tank until he feels better, maybe a week at least. For example I had one tiger barb who was losing out on food and hiding, got a little discolored. Stuck the the little guy in a 5 gallon quarantine, used Kordon Fish protector for the duration (over a week), did daily water changes and bam...little guy is back in the 36 for months and doing great. Don't be afraid to hospitalize your fish if they seem abnormal, stress and loss of colors can cause the fish to be susceptible to disease. He's probably just nervous with the other fish for some reason. You could also add some garlic guard to get him eating more and coloring up.

I'll also add that when that Tiger Barb was introduced they were all QT'd together. They got along great for weeks then just began getting stressed. It seems to just happen when the other fish think someone is weak, they may chase them extra when you aren't looking. Or many other things the fish do when we aren't around.

Both Kordon Fish Protector and Garlic guard aren't really medicines but will ease the stress

 

Thank you. I will keep it in the 5 for a bit.

The 5 isn't exactly a hospital tank.
I have 3 shrimp and a honey gourami that I call my little nemo. I believe he was born with some problems, it's easier on him not having a huge amount of space because he's just so small and is kind of weak compared to my other gourami in 15.

Once the 46 gallon is finished cycling everyone is getting upgraded and we are gonna get a betta for the 5.

I'm assuming garlic guard is essentially the easy way of crushing up garlic, mixing with water and soaking the food in it for a few minutes(this is generally what I do when I notice fishies are stressed or look like they just need a boost).

I use kordon novaqua plus and kordon amquel plus. I like the brand a lot. I will be sure to add the fish protector to my arsenal to help it get back on track.

I noticed there's another slightly smaller rasbora that is kind of pale in color however the other aren't picking on it and it's eating/acting fine. Should I just wait and see with that one?

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Thank you. I will keep it in the 5 for a bit.

The 5 isn't exactly a hospital tank.
I have 3 shrimp and a honey gourami that I call my little nemo. I believe he was born with some problems, it's easier on him not having a huge amount of space because he's just so small and is kind of weak compared to my other gourami in 15.

Once the 46 gallon is finished cycling everyone is getting upgraded and we are gonna get a betta for the 5.

I'm assuming garlic guard is essentially the easy way of crushing up garlic, mixing with water and soaking the food in it for a few minutes(this is generally what I do when I notice fishies are stressed or look like they just need a boost).

I use kordon novaqua plus and kordon amquel plus. I like the brand a lot. I will be sure to add the fish protector to my arsenal to help it get back on track.

I noticed there's another slightly smaller rasbora that is kind of pale in color however the other aren't picking on it and it's eating/acting fine. Should I just wait and see with that one?

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If the small Rasbora doesn't look as bad as the other you may just want to play it by ear. I would just keep an eye on the smaller Rasbora personally.

 

Ok just an update...

The small rasbora is still not being chased and is acting fine.

The bigger one that I moved to the 5 gallon is the exact same, however I did notice something..

This sounds completely bananas but when the lights go out he loses almost all color. After 20ish minutes of me turning the lights on he gains all of the color back up to the point that he usually does..

The purple and the pink is vibrant it just doesn't cover it's entire body like the 8 others.
Could it be that it's a female?


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