Nice, my resevoir I don't circulate it or aerate and no problems man. Just fill it back up after 4days. Easy Peasey Canna told me that coco is aerated enough. When you water , they drain the perfect amount and it sucks in new air. I don't ph anymore, it's alwase perfect. Res Temps are in range... Probably 20-23 c No slime , just some salt resedue from the water going down.