I'm not sure what the probio is, but as long as it's a bacteria innoculation, you have to be careful when using pellets. Very, very careful! The thing about pellets is that it's an adjustable and live animal population filter. Once you understand that, and I don't think most people do, it helps a great deal.
I run pellets and gfo to get a ulns. My levels are No3-.02, Po4-.01. If I didn't run gfo, my levels of Po4-.05. I only add bacteria (ecobak) twice a month(6 drops)for keeping my bacteria population up due to possible loss from filtration, etc. I also run a recirculation reactor, which is much easier and more effective, to adjust and really control your levels, making sure that you are only pulling the right amount of nutrients. I also test once a week for phosphate level for gfo life. I have been running this setup since February, and the only drop off I had was an experiment that went a little off in May. That was when I began using the ecobak. Since then, it's just been deciding where I want my Po4 to be.
I do not run carbon at all, but when I did, it was only spot polishing. Like 8 hours max, and it was a very mild carbon. Brs lignite was even too strong to be in there f four more than 24 hours. Right now, I am trying out Purigen as an experiment versus the carbon.
It's really easy to (at least on my system) overdo things as far as bacteria, so less is actually better as far as dosing for me. I found that a lot of times, in the beginning, I would dose something, then the bacteria would kick in, and pull much more than I thought it would. I always did doses in moderation, but it was much more effective than the dose stated, so I then had to adjust for that.
But for me, it's great not having to worry about nitrate, phosphate, and having great color and growth. I have never had this success before with any other filtration methodology or combination.
I also feed everyday, at least once or twice with approx 3 (6 if 2x a day) pinches of pellets or 5 grams of frozen (the frozen is more of a treat). I also feed a full sheet(i believe they are 6x6 sheets) of nori every other day on top of the pellets or frozen.
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