I just got a 4 gal waterbox aio. I have a 75g which is an established tank, and a 70.2 waterbox which is cycling with dry rock to have the 75 transferred into it. Since I’ll have no use for the rock in the 75 after the transfer I’m thinking of using a piece to seed this 4 gal pico. What’s the best way to go about this? Any tip? I’ve only started with dry rock in both of my larger tanks.