Urgent! Help With Finrot!

[hollyp0p]

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Tank size: 45 litres
pH: 7.2 (this has stayed the same from the beginning and has not before affected anyone)
ammonia: below 0.25.....near to 0 but not sure 100% if it is 0
nitrite:0
nitrate: around 5 ppm
tank temp: currently 25 degrees celcius

Fish Symptoms (include full description including lesion, color, location, fish behavior):

Volume and Frequency of water changes: 25% every week, though added melafix and aquarium salt last night and intend to keep doing daily with melafix unless better solution

Chemical Additives or Media in your tank: melafix since yesterday to treat and aquarium salt

Tank inhabitants: 1 male betta, 4 zebra danios, 5 tetra and a newly purchased pitbull plec (i think the cause)

Recent additions to your tank (living or decoration): pitbull pleco


Digital photo (include if possible):

The state of my bettas tail is no worse today on bottom, infact sort of looks better, but the top half has recded to about half way up his tail......is treating with melafix and daily 25% water changes with aquarium salt ok??
Also can anyone tell me how you do a salt bath for the betta, and whether maybe I should get him a floating tank part to keep him seperate and his water completely clean???

 

[hollyp0p]

Odin is currently enjoying a salt bath in about 1 gallon of water with 1 tsp salt that I found directions for doing on another thread from ages ago.....he seems to be quite chilled out in there

 

[hollyp0p]

Odin update:

Yesterday was the worst day so far his tail is now about 1/2 missing in some parts I feel so bad for him, even though he is still acting normal, slightly less parading around than before.
But this morning the loss seemed to have slowed a great deal, and over the course of the day I'm not sure he lost anymore.....hopefully it's halting/ed!!!!!!

I spoke to the aquatics guy where I worked and as alot of other ppl told me, melafix won't be curing it, I think the salt bath I gave him last night might have helped....and he's just had another for nearly 30 mins with more salt today too (1tbsp for 1 gallon)....anyway yeah I was advised because I am sure the fin rot is bacterial because it came with a new fish or his water (not sure which).....to buy some pimafix to treat alongside the melafix, which upon reading a few places seems like it could be the answer *fingers crossed*

Odin so far is not bothered by the melafix......and since adding the pimafix also....none of my fish babies seem bothered

so yeah......hopefully it will now halt......and healing can continue!

Also if/when healing starts.....how long should i continue using melafix for?...how much growth??