I have a 20 gallon tank with 2 bristlenose plecs, 3 dalmation mollies, 4 neon tetra and an angel fish. my question is this, my son in law who has a similar sized tank always seems to have ribbons of pooh all overs his tank and hanging from his fish, I don't seem to get this. I feed flakes and plec pellets once a day six days a week and mashed up peas once a week (I work on the premise that the stomach is the size of the eyes), should I be seeing my fish pooh more regular, sorry if this seems a silly or disgusting question but being somewhat new to this I would like to get it right