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Hi all, Am selling my zebra long spined sea urchin (Echinothrix calamaris ?) @ $8 as it is out-growing my nano-tank. Collection is in Hougang. Size of test is about 3cm, spine is about 3-4cm. This is a nicely colored urchin (greenish blue test with olive green/brown stripes) and is efficient in eradicating algae of all kind - even red turf algae, unlike the purple urchin that I have - which basically do nothing about algae and hide all day in cracks and crevices. Sad to let it go as it has been with me in my nano for many months since my old nano setup. Good for keeping algae on rocks at bay. SMS me @ 96399447. Raiden