I still laugh at that video you did with the main pump assembly when @GoVols tried to confuse me with his pump assembly inadequacys!! Very amusing and so simple! LolI also had 2, that was the newer one...now i'm back to one with no spare's available here (i could order in tho,the dealership has recently changed & parts aren't off shelf yet) so after doing a vectra/vario/tunze/eheim research weekend i've decided i'm going to see how one of those dcp jebao goes.
If i stay down at the 10000 model i think i can move the pump into the bottom of the front media chamber & that will give me the normal return chamber as a frag section...will see how that plan goes