I see white sticky whighy organisms on the inside of fish tank's walls. They extend from bottom to 1/5th height of the fish tank only. They get easily scrubbed off. This is their secind appearance after i scrubbed them off last week. My 33g has 5 young discus, 2 rams and 9 cardinal tetras. Are the white things white algea ? Or ich eggs (none of the fish have ich spots) ? Or something else ? Please see the image - just above the sand, on the below-left and below-right of the fish. Kindly advise.