I made few experiment latelly with bp and get some unusual results. I used bp in 3 various reactors in 3 aquariums for 6-7 months already. In main aquarium I had 100 mg/lit nitrates and that was my main goal, to lower those nitrates with bp, I used vodka before in that aquarium and vodka did not lower the nitrates significaly, latter I used high dosage of vodka together with bp and even that was not droped nitrates significaly or steady. I even used 3 diferent reactors together in that aquarium but that also did not lower nitrates significaly, for months.
Until 10-15 days ago when I made some changes to my diy reactor (removed sponges, instal bal valve to get fluidization, washed bp with aquarium water) and then after day or two my aquarium get cloudy, bacterial string was everywhere in the aquarium and nitrates drop dramaticaly, low to 0,2 mg/lit.
I removed that reactor to the third aquarium who had 50 mg/lit nitrates and next day I have bacterial bloom inside the aquarium who completly cloud that aquarium. After 2-3 days I removed the reactor from that aquarium too and water get cleared, nitrates drop to 5 mg/lit in few days.
I washed the bio pellets and reactor in fresh water very, very well and few days latter I install him again on that aquarium, next day I get bacterial bloom again, not so hard like first time but very cloudy.
BTW that was old bio pellets what I use from the begining, 6-7 months already, and not the new bag. So what is that what sudenly initiate bacterial bloom with bio pellets in 2 aquarium even they was used for months without this efect?
I use bp in my diy reactor made from octopus calcium reactor, pump are aprox 1200-1400 lit/hour , aquaclear 4000 from Hagen, is a strong powerhead, bp are tumbling also.
One thing I notice, when I used bp before without "efects" (no dramatic nitrates lowering for months) bio pellets was more brown colour, looked "dry" inside the reactor (can not find better word to explain how they look) but this time (same pellets) look totally white inside the reactor and they are capable to ignite bacterial bloom and lower nitrates in days significaly.
Is really weird IMO that after few months of using sudenly with my diy reactor I get dramatic and totally diferent results at various aquarium in just few days. First time when I get bacterial bloom/cloudines in my main aquarium I thought that was because I used vodka together with bp and that somehow create bacterial bloom, but I removed them on second aquarium and they create bacterial bloom in that aquarium too, even after very detailed washing in freshwater they create bacterial bloom second day after starting.
In same time in my third aquarium are 1000 ml of bp for months in fluid reactor without smallest sign of bacterial bloom or cloudines, also nitrates start to raise in that aquarium.
It look like bp need some ignition, still unknowen to me what is that, who will made them bacterial machine in short period of time.
I am curious, does the reefer who used bio pellets and dont have results (no nitrates drop) have more brown/yellow or white bio pellets inside the reactor?