No sign of white films or strings of bacteria. I have a filter sock so I can try this.
Is it possible that the pellets have the potential to increase NO3 when it´s not "working"?
I must be doing something wrong here but I can`t figur out what.
What sort of pump are you using to create the best flow?
Here is filtersock on my diy working reactor, after the cleaning, no bacteria
24 hours latter, full of bacteria slime
If I dont clean sock after 24 hours in 48 hours is like ballon.
here is my skimmer production in 24 hours
Every morning I clean skimmer cup, sponge and filtersock. IMO those a sign of working bio pellets and bacteria production.
I dont know how I can test posibillity that bp increase NO3 when they are not working, I personally doubt that bp contribute to NO3 increase, they not adsorb nitrate so can not leach them. My experiment with jar show that they can completly neutralize nitrate, I still have those jar on my table so I can measure nitrate again to see if they arise, they was 0. What was suprise me is the coming back of algae and nitrate after they was removed (bp) they come back very fast, I dont think that is related with bp but with carbon nitrate removal.
I use old hagen 404 powerhead, flow declared on pump are 1400 lit/hour but pump is old, at the outlet of reactor flow are around 550 lit/hours. Every pump what can tumble the bp are good, IMO.
I suspect, could be wrong also, that your bp somehow stop working, what is the cause I dont know. Put the filtersock at the outlet and if there was no bacteria for few days bp probably dont produce them.
I didn't lose any corals but I see some was affected. My brain coral isn't as bright and big like it used to be. The bubble coral isn't fully open. My duncans have never opened since I have added the biopellets. The zoas aren't fuly openning as well. I'm sure they will recover but it will take some time. Also, my skimmer is still working very hard but I haven't had to empty it as much as last time.
Change the water and start to feed them (target feeding) in case of bleaching move them in shade and feed, I would also use some kind of reef food (frozen/blenderized) with small particles what can trigger the feeding response in afected corals. If the situation do not improve I would remove the bp and start to feed aloot. Something like that was happening to me during one bacterial bloom, some corals get afected and bleached, move them in shadow (trachyphyllia) and target feed, as well I dump toons of blenderized diy food to rise the nutrients again. I think bp and bacterial bloom remove to fast everything organic from the tank including food for those corals what afected them.