9 best beginner Marine Invertebrates. Hardy + peaceful + widely available species perfect for new aquarists.
Best all-around algae snail. Eats film + GHA. Won't reproduce out of control.
Sand-bed worker. Surfaces at feeding time. Eats detritus.
Small + active. Sand + glass cleaner.
Cone-shaped. Algae eater. Falls off rockwork.
Affordable, peaceful, eats detritus + algae.
Larger than blue-leg, more peaceful. Best hermit for reef.
Reef-safe, eats parasites off fish. Pair-bonds.
Eats aiptasia. Reef-safe.
Eats bubble algae + bryopsis. Add only if you have a problem.
Browse all beginner pick guides. Pair with step-by-step setup tutorials + the stocking calculator for a complete first build.