Air draws:
SP-1000 (curve 5 pump): 300 L/H
SP-2000 (curve 7 pump): 520 L/H
SP-4000 (curve 9 pump): 900 L/H
And yap skimmers are most of the time overrate. About half to the lowest number in the rating is about right.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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