Hey all and thank you for your replies.
crystalicethorn- He is usually kept in a large barrack tank with 9 other males. Each compartment is heated and filtered and they are cleaned out 2-3 times weekly. I keep no gravel in my betta tanks specifically so that I can keep them nice and clean due to their tendency towards bacterial infections. This guy has been suffering from this for about a month.
LittleBlueFishlets- Originally the treatment plan for the Neomycin was 100% daily water changes and Neomycin dosage for five days, when it wasn't working the vet suggested following the same regime for a further five days. Today is the last day and this guy is still getting worse. I am considering giving him a weeks break from meds with some IAL in his water and then seeing if the vet can suggest another antibiotic that targets gram- negative bacteria. The poor boy has been through so much. I originally bought him as a rescue because he had bad fin rot and velvet. I cleared up the fin rot and velvet but he keeps getting the fin rot back despite his regularly cleaned tank. I try to feed them a good diet too, they get Atisons betta pro pellets twice a day and once a week they get a mixture of frozen black mosquito larvae and brine shrimp. I am planning on getting a large variety of frozen foods for them.....makes life a but more interesting for them and also a varied diet is healthy for them. I will definately look into the vitachem....sounds like he might benefit from it, just hope we can get it here in Australia....even when they don't contain S4 drugs a lot of products are difficult to get here.
logisticsguy- I think I can get the paragaurd from a LFS here so I will definately look into getting some.
SerenaRena- Thanks, Will definately look into the API tail rot medication.