White Spot near Tetra's Tail

bcfishtanks

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Hello, everyone! No picture yet (I'll get one in the morning), but I noticed a white spot near one of my tetra's tails. It it is not fuzzy, flaky, or raised. I only just noticed it this evening, maybe 3 hours ago. I just did a water change earlier today Here's some info on this particular fish:

I've had her and the other glowlights for almost a year. She seems to be the leader of the school. She is also my largest female that all the males was to mate with, but she currently is not gravid. She is swimming directly into the current of the filter, which one of my other tetras did for 2-3 days almost nonstop before jumping out of the tank (she survived) several months ago (not worried about a jump tonight. The top is mostly covered). This particular fish also perpetually has a clamped tail, though the rest of her fins are held normally.

What I Know the White Spot is Not:
- ich
- fungus

It doesn't look like the start of columnaris, but I've never had personal experience with it, so who's to say? I have Cupramine and aquarium salt as current medicines on hand, though I don't like separating the school if I can help it. Let me know if you have any thoughts as to what it could be, and I'll upload a picture in the morning.

Tank
What is the water volume of the tank? 29g
How long has the tank been running? 3-4 weeks (everything was moved over from a 6-month old 29 g)
Does it have a filter? Yes, HOB
Does it have a heater? Yes
What is the water temperature? 78-79 degrees F
What is the entire stocking of this tank? (Please list all fish and inverts.)
7 glowlights, 2 honey gouramis, 9 cory catfish, 1 nerite, 1 ghost shrimp, bladder snails

Maintenance
How often do you change the water? Once per week
How much of the water do you change? 20%
What do you use to treat your water? Prime
Do you vacuum the substrate or just the water? Water only (too many plants to do the substrate)

*Parameters - Very Important
Did you cycle your tank before adding fish? Yes (in the previous tank, since everything was moved over)
What do you use to test the water? API Liquid Test Kit
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.
Ammonia: 0ppm
Nitrite: 0ppm
Nitrate: 0ppm (because of the plants)
pH: 7.2

Feeding
How often do you feed your fish? Once per day (unless getting a snack)
How much do you feed your fish? Three tiny crushed up pinches of flakes
What brand of food do you feed your fish? Top Fin
Do you feed frozen? Sometimes. 3-4 times per month. Bloodworms or brine shrimp
Do you feed freeze-dried foods? No
 

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  • #3
Just woke up and took them! The second is better than the first. She's behaving normally now, and the white spot is (luckily) the same size as it was last night.
 

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  • Thread Starter
  • #4
There has been no progression of the white spot throughout the day and no behavioral changes. My betta (different tank) also seems to have white marks on his back (also noticed around the same time last night). They almost seem to be between his scales rather than on them. He does have a driftwood-only tank, and he likes to sleep under his cholla log, so it's possibly a scratch. But it's not missing scales, which show up as gray on him. I'm hoping these aren't related.

No behavioral differences in either fish. The tetra is actually behaving normally today, unlike last night.

(Also, he has always had slightly flared gills since the day I got him. This is not a new development)
 

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