I have a favia brain for almost 7 years. it has grown from a 3 in piece to more than 12 inches accross,but, it is now drying. the only change in the last month has been a change to nx pellets and the use of mb7. all parms has been good, with no spike when i stopped using gfo. i have had a similar die off of a orange monti , where about 1/3 of it died off but, the rest looks good and healthy. parms are: temp 77 cal 420 alk 9 phos 0.05 nitrate <.05 mag 1500 feeding consits of mysis,phtyo chrome,phtyoplan on a rotating basis.anyone have a die off when changing to a carbon based system?