2 Koralia 1's i a 29 would end up with 29.5x turnover per hour which in my opinion would be kinda high for softies but not unheard of. Space wise it might be better to go with a pair of nanos.
I have one K3 and one K1 in my 29G and I have the K3 flowing from left to right and the K1 blowing right to left and its fine. Just depends on how you place them and what you will keep.
i have a k1 and a nano + filter and skimmer. nano blowing across the back behind the rocks and the 1 angled up creating alot of surface movement my fish like to swim in the current as the flow from the 1 comes back down
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