search online or facebook fish groups, there's actually quite a few ppl selling acrylic "holders" for K1 u can get ideas from.
alternatively u can just use a very porous material to block the flow from the chamber u want to use k1 in, so the k1 cant pass through but it wont have any impact on the water flow through it.
or just make a simple mesh cage which is ugly but who cares since it's in the sump lol.
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