I got my 2 new fish thursday 1 male 1 female there in my 90 gal tank with 3 tetras (1.5") and 2 plecos (3") and my sons foolish id shark (6" so far) that usually sits at the bottom of the tank , they look ok but there just sitting there in the corner at the top of the tank? ive seen them swim around a little but it seems they like that corner i need to kneel on the floor to even see them are they just not sure of the tank yet?