I have a VT betta in a 5 gallon heavenly panted tank. I am injecting co2 using the EI dosing method with seachem products (will switch to DIY when they are gone) water peramiters:
Nitrogen 10 ppm
Ammonia and nitrites 0
Weekly 50% WC
Hope I have not forgot anything
I just noticed yesterday a few holes in my bettas tail fin, in a line almost. Today those holes are slits/splits. Tank mates 3 small SAE. The tank is a 5g fluval spec with a recently upgraded filter pump 200gph with spraybar pointed at the glass to difuse the current. Seachem purigon, biomax and poly fiber in filter with black sponge. I will post pics if I can get the big guy to hold still. Oh, and he is more agressive with the SAE and making big bubble nests. In some ways he seems happy (bubble nests) but there is something up (increased aggression and tail fin damage) I do not even know where to start to help my guy.