ok i am going to do a small diary using these pellets, a lot of guys are having great success over the pond with these, and a few in the UK too. not sure if anybody else has tried these yet on TSB, but hopefully they have and can share experiences. i don't really struggle with nitrates, but phosphates still elude me a little, so hoping they will help somewhat towards that. along with a better water quality, which in turn will hopefully lead to better colouration & growth in my corals. only time will tell. for those who haven't heard of these, NP Bio Pellets are a unique carbon based polymer that doubles as a substrate and food source for aerobic and anaerobic bacteria. Like adding a liquid carbon source such as Vodka or VSV. The BioPellets are composed of biologically degradable polymers that can be placed in a fluidized filter or filter canister. The pellets will allow aerobic growth of bacteria which consequently will consume nitrate and phosphate simultaneously. The bacteria will use up the carbon from the BioPellets, whilst nitrogen and phosphorus are taken from the water as nitrate and (ortho)phosphate. This conversion of organic BioPellets (together with inorganic nitrogen and phosphorus) into microbial biomass is called immobilization. In addition, anaerobic layers will develop, resulting in additional denitrification. I am going to run these in my deltec FR509 fludised reactor. This is also where i came across my first problem, in they are quite hard to fluidise,even with a very small amount, maybe 200ml they still sat at the base in a clump with the MJ1200, so a bigger pump was needed ( many thanks to Lee, who stepped forward with the newjet 3000, and thanks for the other offers too guys [thumbup1.gif] ) after fitting the pump, they still would not fluidise properly, until i changed the pipework to the reactor to a bigger bore tubing, then it came to life [w00t.gif] , and i added more media taking it up to around 700ml. This may prove to be a standalone media, with just the addition of bacs a couple of times a week, which would then lead to doing away with the tedious tasks, for intstance, 0.6ml of start2 twice daily, trimming and pruning of cheato, etc etc etc. and as they slowly get eaten over time by the bacteria, its simply a matter of topping up. ok. my test previous to today where SG. 35ppt PH 8.32 Temp 25.0 Mag 1260 Cal 420 dkh 607 P04 0.08 N03 4 i slightly upped my calcium reactor, due to wanting to slightly up all 3 of the basics, mag,cal & alk, so i will be able to check the progress of this also in the next week or so until it gets to a level i am happier with. From what i have read already n03 can drop drastically over a couple of days, so if nitrates are high, to introduce the pellets slowly over a couple of weeks, adding to them every couple of days until the amount you require is required. can also turn water slightly cloudy for a few days when the bacteria start to colonise. hopefully this will both inform people of the product & show if it works not only as an n&p reducer, but also as a ulns option.