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When we were living in southern California, I found one of these in our bathtub. I also found one clinging to a wall in our living room, and crawling around our apartment. We lived near the ocean, but not near any freshwater bodies of water. We think it lived in our drains. Gross and scary! I sure wouldn't want to be bitten by a bug that huge! We did manage to get rid of it, eventually.
20 gal. high: planted; 5 white cloud minnows, 4 golden White Clouds, several RCS, 2 blue shrimp, 5 Amano shrimp, several snails; Azoo air. 65 gal: planted; 6 rosy barbs, 6 yellow glofish, 3 red glofish, 3 zebra danios, 5 white cloud minnows, 3 dojo loaches, 6 crimson spot rainbow fish, 12 large Amano Shrimp, several snails; AC110.