From experience you should look at Nitra Guard instead if you really want to use carbon dosing. It is way less hassle to mess around with and you will get better results with half the work. Any time I used bio pellets it was a constant struggle. They needed constant attention or you risked clumping and settling and I had to adjust water flow to compensate. I had a bacterial bloom a few times where a huge amount slogged off and made my tank cloudy. I finally got so fed up with bio pellets I switched to Nitra Guard and what a difference. You don't even need a reactor just a air stone and a pump and every few weeks you open the bag they are in and add some more.
From experience anything that clams it is all in one is BS but I do understand the allure of all in one. One part always gets exhausted faster then the other and it is impossible to control the ratios of what you need. Say you need more nitrate removal but little phosphate removal or vise versa. You can't adjust to your needs and all you can do is add more media or less media. It doesn't give you the granularity of stand alone media where you can adjust your ratios as needed. Plus looking at the huge size of those bio pellets they look like they need more flow and would be a pain to keep afloat and suspended in the water for long term. Especially once they have been running for a few months and are loaded with bacteria. They look like a nightmare for clumping and pockets of settling.
My advice is unless you are having an issue with algae, super heavy bio load or the tank is new and you need something to handle waste till the bacteria population build up and the tank becomes stable you don't need bio pellets. I found unless you meet those criteria you are setting yourself up for a slime algae bloom or other algae issues. Bio pellets always caused me issues if i didn't stick to those rules.
