I have 1 on my 75. Had it for a while since the GB here. I just cleaned it yesterday because I've had it on else mode (which is usually overkill for my tank) and it was not enough flow. Took it apart soaked it in water + vinegar for 45 mins scrubbed it with a toothbrush and it's all better now. I can't keep it on else mode Its way Too powerful. w1 s2 for now.