Help with Canary Blenny: Part of Tail Missing & lumpy belly

[PrinceRock]

#### Issue:
I noticed about two days ago that my Canary Blenny was nipping at its tail and occasionally rubbing against the live rock. Upon closer inspection, I saw that the top end of its tail fin seems to be missing (see photos). I've been looking for answers all weekend but haven't found anything substantial. The Blenny is eating well and actively swimming. It likes to perch near the wave maker at night, so I'm wondering if it might have injured its tail there. Should I wait it out or proactively treat it?

#### Additional Concern:
I've also noticed that its belly appears lumpy (see photos). It gets lumpier after feeding, and I'm not sure if this is normal or a sign of a parasite. This is my first reef tank and my first Blenny, so I'm unsure.

#### Tank Details:
- **Size:** 21g AIO
- **Cycle:** 6 weeks
- **Fish Added:** 2 weeks ago
- **Quarantine:** I did not quarantine my fish before adding them.

#### Stock:
- 2 Ocellaris Clownfish
- 1 Canary Blenny
- 1 Tuxedo Urchin
- 6 Blue Leg Hermits
- 4 Red Leg Hermits
- 1 Halloween Hermit
- 8 Astrea Snails

#### Food:
- Mysis Shrimp
- Brine Shrimp
- Prime Reef Flakes

#### Tank Parameters:
- **Salinity:** 1.025
- **Alkalinity:** 9.0
- **Ammonia:** 0 - 0.25 ppm
- **Nitrite:** 0.25 - 0.5 ppm
- **Phosphate:** 0
- **Temperature:** 78°F

### Questions:
1. Should I wait and see if the tail heals on its own or should I treat the Blenny proactively?
2. Is the lumpy belly after feeding normal, or could it be a sign of a parasite?

 

[KrisReef]

Looks like it is bifurcated into to fin rays, one or both were probably damaged and it appears to be healing.