I bought several 4's off ebay a couple of weeks ago, best price I could find. They came from cali, a little slow on the shipping, but for the price it was worth it.
When you say Koralia nano do you mean the smallest nano model (less flow than the K1?) They should have shipped out from wholesalers last and this week and hopefully arriving this week at least one LFS that I know of.
For a 30g cube I'd go with at least a Koralia 1 if not a 2. A 1 is really pretty gentle flow for my 34g.. I could go with a 2 but I've had luck with repositioning it to get it just where I want
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