i have a 29 gal tank that has a dwarf gourami 2 guppies, 6 cherry barbs and what i thought was 3 ottos. after a while of not seeing the otto's stuck on the plants i did a recon on the tank to find them. i looked under all the caves and every spot that they could hid but can only find one. they arent in the filter or intake tube. my only guess is they got buried in the sand during a water change or something. anyone have any advice or experience on this?