I have never used any of them, but I have seen both Interpet and Tetra medicines. Interpet are ok at treating other things, but it might be best to go to a decent LFS and seek their advice on which one. I would also get some aquarium salt, either to dose with (check medicine instructions first though to see if you can) or to keep in for future emergencies as it is good stuff.
Interpet works great, follow the instructions correctly, it erradicated the whitespot, and have had no recurrence.
Quarantine him as soon as possible, like fish protector said raise the temp. If necessary use medications. Just use a little bit of med at 1st though. Hope this helps
I would suggest that you don't "just use a little bit", I suggest you follow the manufacturer's instructions.
Do not add salt. get Mardel coppersafe ich treatment. it works fast. remove filter when using treatment. my gourami had ich for four days and lived through it. turn up the heat a little. most likley it came from the fish you bought. next time you add new fish, allow a day for them to settle and then add ich treatment. please do not hesitate!! if you wait to long your betta will die and the others will catch it!!
Only remove a carbon filter, if you have one, and Zeolite if you have that. Don't remove any sponges or ceramic biomedia. The Interpet med states that it is safe for bacterial filtration, and certainly I suffered no ammonia or nitrite spikes having used it. If you remove the bacteria from the filter (a) the fish will poison themselves and (b) some or all of the bacteria will die, meaning you may get an ammonia or nitrite spike when you put the filter back in.
If you don't have a carbon filter, go and buy one, and put it into the filter,
when you have finished the course of treatment. It will remove the medication from the tank water. It's always a good idea to have a carbon filter in the cupboard for this sort of situation.
With regard to PQ's comment about adding a whitespot medication as a matter of course when acclimating new fish, I would advise otherwise. These medications are basically poisonous, although in such weak concentrations that the fish do not suffer long term. However, I think it is unwise to expose the fish to it unless it's actually necessary.
