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Discussion Starter · #1 ·
My betta Sushi has developed a bubble like growth on the right side of his dorsal fin and has been there for about 2 weeks now. It hasn't really grown at all since I first noticed it. He doesn't seem bothered by it but I don't know if he is sick or if it is just a build up of cells on his fin. Could anyone tell me what this mysterious growth is? Thank you!

1. Size of tank? 1.5 Gal

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

3. Temperature? 80-82

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

5. How long the aquarium has been set up? 2 Months

6. What fish do you have? How many are in your tank? How big are they? How long have you had them? None

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

9. a. Filtration? Yes
b. Heater? Yes

10. a. Lighting schedule? What lights are used? LED Light couple hours
b. Any sunlight exposure? How long? Very little

11. a. Water change schedule? 50% Wed then 100% Sat
b. Volume of water changed?
c. Well water, tap water, RO water? Tap
d. Water conditioner used? BettaSafe
e. Frequency of gravel/sand (if any) vacuumed?

12. Foods?
How often are they fed? twice a day Tetra betta pellets

13. a. Any abnormal signs/symptoms? White/pink growth on the side of dorsal fin
b. Appearance of poop? normal
c. Appearance of gills? normal

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

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


60 Posts
Well, First of all, Beautiful fish you've got! But the growth shouldn't be a problem. As harmless as it seems, if it is a fungal infection (i believe it is) it needs to be treated ASAP. I would recommend Pimafix. Here is a link for purchase on Petco's website. May be cheaper from Petsmart or a different LFS. But this is my best suggestion. Good Luck! API PimaFix at PETCO
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