i have 3 sens, 1 albino, 1 delhezi and 1 ornate. all have the size range of 3.5-4.5 inches each.. what do the most prefer food for them? and is it ok to put some driftwoods in my tank for their resting place? and is it also ok for them to put them all in a 20 gal aquarium? thanks for the replies. newbie in raising bichirs..