Hi everyone, Two days ago, I switched the standard outlet of my Eheim Classic 2213 for a glass poppy pipe. At the same time I started dosing some liquid carbon fertilizer ("easycarbo" by easy-life, some equivalent of excel i guess). Last night as I woke up in the middle of the night, I found all my rasboras gasping at the surface, and all my shrimps as high up as they could. I raised the Poppy outlet way out of the water, added and air pump and went back to sleep. In the morning, one shrimp was dead, everybody else seemed fine. Tonight, before going to bed, I checked to see if everyone was breathing OK. The rasboras seem to be doing fine, but all the shrimps are high up in the plants once again. I raised the poppy and put the air pump. What can I do? My tank is a 30 gallon lightly planted (some elodea, some dwarf baby tears, some weeping moss, some marimo moss balls). During the day, I try to lower the poppy outlet so that it's silent (while still being as high as possible for maximum aeration) but that doesn't seem to be enough at night. Or maybe it's the dosing that makes the plants consume more oxygen at night?