1 or 2 teaspoons for each 10 gallons of tank water should be enough.
I have done that with L-114 in the tank without problems.

Thank you for your answer.

Hi,
I would like to know if this Ancistrus i recently bought is a regular Ancistrus sp. or something else.

The orange seam in the caudal fin gets me confused.

Is it male or female

I got it practically free, starting Sera bactopur direct treatment soon

I have no idea how long it's been infected, found it at a small local shop this week.
Thx for the fast reply.

Anyone have an idea what this could be and how to get rid of it.
It seems to be under its skin.