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Hi everyobe I'm new to fish keeping and recently got a betta from the pet store I've had him for around 1 month now, he came in with some mild fin rot with just the edges of his tail blackened from there till now he has been doing well but this morning I woke up and his tail was all frayed his gills were blackened at the edges, as of now he is living in a 5 gallon tank with live plants only, I thought I might've been an ammonia spike so I've done a 50% water change but he isn't looking too good, pls help! View attachment 845167
Please take a moment to answer these questions. The more info you can give the faster we can help.

1. Size of tank?

2. Water parameters
a. Ammonia?
b. Nitrite?
c. Nitrate?
d. pH, KH and GH?
e. Test kit?

3. Temperature?

4. FW (fresh water) or BW (brackish)?

5. How long the aquarium has been set up?

6. What fish do you have? How many are in your tank? How big are they? How long have you had them?

7. Were the fish placed under quarantine period (minus the first batch from the point wherein the tank is ready to accommodate the inhabitants)?

8. a. Any live plants? Fake plants?
b. Sand, gravel, barebottom?
c. Rocks, woods, fancy decors? Any hollow decors?

9. a. Filtration?
b. Heater?

10. a. Lighting schedule? What lights are used?
b. Any sunlight exposure? How long?

11. a. Water change schedule?
b. Volume of water changed?
c. Well water, tap water, RO water?
d. Water conditioner used?
e. Frequency of gravel/sand (if any) vacuumed?

12. Foods?
How often are they fed?

13. a. Any abnormal signs/symptoms?
b. Appearance of poop?
c. Appearance of gills?

14. a. Have you treated your fish ahead of diagnosis?
b. What meds were used?

15. Insert photos of fish in question and full tank shot if necessary.

354 Posts
As @Dartmouthseven says , you want 0ppm of ammonia , I also suggest instead of letting the water sit for 3 days that you use a water conditioner that Detoxifies (removes) ammonia , nitrites , nitrates , chlorine , chloramines and heavy metals for all water changes and top offs. I've recently started using the new to market API Aqua Essential , but any water conditioner that detoxifies those things is far better than just letting the water sit. And / or because you said you didn't have a chance to properly complete the nitrogen cycle before adding the fish , I also suggest you use a "good" bacteria starter additive such as Dr. Tim's Aquatics "One and Only" , API Quick Start , Tetra Safe Start Plus. I hope this helps.
I just started using API's new conditioner as well. It's cheaper than Prime and does the same thing.
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