I bought Siamese Algae Eaters by mail about a month ago. They were very tiny - about 3/4 of an inch. Three survived and are in a quarantine tank with 9 Amano Shrimp and a dwarf flash pleco. Before we went on vacation for two weeks, they all swam around the tank and would hang on the glass to eat. Two were often together, and the third was sometimes by itself and sometimes with the other two. When we came back four days ago, I couldn't find the SAEs at all. Finally I found that two of them have taken up residence under a piece of driftwood. One faces one direction and the other the opposite, with their heads positioned so they can see out, but their bodies are hidden. The third is on the opposite side of the tank hiding in a sponge filter I had removed from the filter intake when I replaced it. I left it in so they could eat the algae. I guess that they got used to the quiet when we were gone and now that there's activity, they're scared. They've grown to about an inch and look healthy. Is this hiding behavior typical for SAEs? Meanwhile, the Amano shrimp are happy as can be and scampering all over. Last night, Waldo, the pleco, came out of the decoration where he lives for about a minute, but he doesn't go near the SAEs and mostly just stays still. I understand that SAEs can be aggressive to one another and I wonder if there will be a problem when they get older with the pair that stay together and the loner.