Air bubbles & mess

Puts a LOT of air bubbles into the substrate of you use it in an aquarium (once capsule dissolves). If you vacuum decently (more than just hovering it above the substrate), or have any digging aquatic creatures, the little fertilizer beads eventually work their way up & create an ugly mess of the substrate, laying there all over the place. Will they eventually dissolve? Eventually. Quite eventually. My plants have done waaay better not using these at all.

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