I'm sorry u missunderstood me a little bit i think. i realize thatyoyu are upset thati took it fromt he wild but it is not all from the wild. The small 1.5 gallon tank has 2 small, the size of my fist, rocks that i grabbed from green key beach. this beach is the dumpiest beach I have ever seen. It is about as long as my house and nobody goes there except rednecks and stoners (and me when I was bored) anyways i grabbed a little water a handful of sand and found 1 small rocksand some rubble. The 10 gallon tank is all bought, well not bought but... not collected form the ocean stuff. aragonite sand from a friends old tank(not live btw) dried base rock from a redneck who through a bottle through his tank and then gave it to me, and bought LR. and a cup of sand (less than a cup) from a generous LFS. I would never rob a reef of all of its inhabitants, i was just bored and saw some small rocks washed up in a mangrove and grabbed them, while walking away, i saw the CUTEST little hermit crab and couldnt resist... sorry bout that lol but he is white with brwon lines and i also caught a bigger one but they didnt get along so i brought him right back, I was careful not to let him touch anything that didnt come from the beach so i wouldnt bring anything bad back to the beach. This is all in the 1.5 gallon.. THE TEN gallon is nothing from the ocean. i was just wondering if the hermit crab and the bought LR from the pico could be put in the nano... i mean if it was safe to. ANYWAYS there is a white bulgy sponge on the back of the LR in the 10 and i was wondering if it was ok. i tried to keep the lr submersed th whole time i took it out for maybe 30 seconds