so i bought a 6 3" Clown loachs and they have been in the little cracks and crevasses of the driftwood. I know that they are extremely good hiders but can this do harm to them? like being stuck or having 2 of them hiding in the same spot that only one can fit in and out? i noticed that there is a slight color fading since i first brought them home. I dont want to see them dying! their tank is a 240g mated with some silver dollars, red parrots, tiger barb and an asian arowana.