I use to use it a few times a week. I love selcon, I would take a cube of frozen food defrost it in a cup and add 3 drops to it. Then I would let it soak over night in the fridge and feed it the next day. I would not feed it everyday it can cause lots algae. You can also dose straight to the tank if you have lots of filter feeders. If you do dose to the tank only dose 1ml per 50gs. I had a 40b with a 20l sump and I only dose 3/4s of 1ml(or what looked like 3/4s). Your tank will get foggy it's normal and should go away within a hour or so.