Allows a rockwool user to seamlessly stack a 4 in cube on top of a 6 in cube or a 6 in cube on top of a 8 in cube—blocking light and eliminating algae, all while allowing in the necessary air a plant needs to thrive.
Grodan Delta 5.6 – 3 in Block 3 in x 3 in x 4 in w/ Hole (32/Cs)
Grodan Uni-Slab 9.5 in x 8 in x 4 in (16/Cs)
Grodan PRO Delta 6.5 – 4 in Small Unwrapped (36/Cs)
Grodan 1.5 in Starter Mini-Blocks MM40/40 1.5 in x 1.5 in x 1.5 in (3 Strips of 15 or 45 ct) (50/Cs)
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