I think vinegar for not a good idea. In vinegar are always accessories for preservation include, better oak extract from the pet shop, are available in different sizes to purchase.
Hydra can be a problem, they can not but be impressed by acidic water. Without chemistry we will not get rid of them. I use Flubenol, unfortunately do not know how the powder is in English. Is not dangerous for fish and works 100%. This powder is used in livestock breeding against intestinal worms and is mostly just to get a veterinarian, at least in Germany. Should you not be successful in procuring have then write me a Privaet mail via the website, I look then if I can help you.
Greeting Bernd
The
PAROSPHROMENUS PROJECT
