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I have a newish guppy I got from a store that developed what looks like saddleback columnaris. I didn't have any Furan-2 on hand, so I have been treating it with good success with Kanaplex (it's looking way way better, all the "fuzzy tendrils" are gone and now it's just a flat pale spot again), but I've finished the recommended treatment routine and she still has a way to go before she can go into the main tank, so I need to do a second round... of something. I've followed the instructions exactly, which say: "Use 1 level measure (included) to every 20 L (5 gallons). Repeat every 2 days until symptoms disappear or up to a maximum of 3 doses."

My Question: I gave her the last dose of Kanaplex (maximum of 3 doses) last night: NOW WHAT? Do I change the water, do another round of Kanaplex? I also have API Melafix on hand, should I do a round of that instead? I do not have any Furan-2 on hand, and she is responding great to the Kanaplex anyway. I assume that I can just change the water (pulling it out of the cycled tank again) and do another round of Kanaplex. The fish does not seem stressed. She is eating great and looking much much better. Water change and another round of Kanaplex (which has worked wonderfully so far) or switch to Melafix and see what happens?


I don't really think all this is needed, but will fill it out anyway:
1. Size of tank? 1 gallon treatment bowl (main tank is 15 gallons)

2. Water parameters: Don't know, don't test, have always had great success with my guppies and haven't needed to test.

e. Test kit? None.

3. Temperature? Treatment bowl is unheated in a 62-65 degree room (warm water makes columnaris worse). When I first saw her white spot, I decided to home diagnose via temperature trial. The tank normally is heated to about 67-70 degrees. I knew that ick improved with high temps and columnaris got worse, and I was pretty sure it was one of those two issues, so I cranked the heat up to 89 (raising it over a 2 day period). Result: her bad patch got REALLY BAD overnight, so thus making it most likely columnaris. I turned the heat back down to 67 in the main tank (slowly throughout the day), and removed the now very furry fish from the tank and put her in a treatment bowl with no heater (cold water) and started treatment.

4. FW (fresh water) or BW (brackish)? Fresh water (hard town water - I live in the mountains and town water is very hard).

5. How long has the aquarium has been set up? The treatment bowl she is in has been set up since I pulled her from the tank - about 2 weeks ago, using cycled tank water. The big tank has been set up since 2015 and doing great until I electrocuted all my fish and had to start over a couple of months ago.

NEXT QUESTIONS ONLY APPLY TO BIG TANK, NOT THE TREATMENT BOWL SHE IS IN, WHICH HAS NOTHING IN IT BUT HER, AIR LINE, AND MEDICATION.

Treatment bowl gets morning sun for about half an hour. Water has not been changed yet. It has no filtration, no heater, no lighting. She is eating daily/normally.

6. What fish do you have? How many are in your tank? How big are they? How long have you had them? Guppies, new stock (all my old stock died when the light fell into the tank so I am starting over with pet store stock) 2 females, 1 male, and all the new babies (probably at least 20 so far).

7. Were the fish placed under quarantine period (minus the first batch from the point wherein the tank is ready to accommodate the inhabitants)? It is a whole new re-stock, so no QT since there was nothing to contaminate - all the old fish died via electrocution.

8. a. Any live plants? Fake plants? One live plant, tiny, struggling a bit (it was also electrocuted but is hanging in there).
b. Sand, gravel, bare bottom? CaribSea Eco‑Complete/lava rock as substrate.
c. Rocks, woods, fancy decors? Any hollow decors? Tumbled rocks (jasper/agate), dead bleached coral, sea shells.

9. a. Filtration? HOB with mechanical filtration plus carbon, Purigen, and bio-media.
b. Heater? Yes.

10. a. Lighting schedule? What lights are used? On when I wake up, off when I think about it after dark. LED "reef" lighting.
b. Any sunlight exposure? How long? No direct sun, but it gets the general daylight/dark cycle from being in a room with a window with no curtains.

11. a. Water change schedule? As needed to clean gravel, vac bottom, remove about 3-6 gallons, never change more than half the volume at any time.
b. Volume of water changed? less than half, usually only a few gallons.
c. Well water, tap water, RO water? Tap water.
d. Water conditioner used? Seachem Prime, Acurel BodyGuard-RX, Seachem Stability.
e. Frequency of gravel/sand (if any) vacuumed? Maybe monthly. Usually less.

12. Foods? Omega One Color Mini Pellets, Hikari Fancy Guppy, Hikari First Bites, Invert Aquatics Mini Algae Discs.
How often are they fed? Daily when there are young stock in the tank that I want to grow up, every other day if not. Algae disks 1 per week to feed the snails and the guppies peck at it as well. Sick fish is being fed daily, only as much as she eats (eating good).

NOW BACK TO THE SICK FISH

13. a. Any abnormal signs/symptoms? Other than the one sick fish with pretty identifiable saddleback columnaris (pale spot that got fuzzy looking when the heat was turned up in the tank), none. Sick fish was hanging out near top of tank but showing no other symptoms.
b. Appearance of poop? Normal.
c. Appearance of gills? Normal.

14. a. Have you treated your fish ahead of diagnosis? No, I diagnosed first.
b. What meds were used? Seachem Kanaplex.

15. Insert photos of fish in question and full tank shot if necessary. Impossible to take a photo in the bowl she is in, too much distortion from the bend of the glass.
 
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