few quick questions

[DEAD_BY_DAWN]

1.ive just placed another 1/2" of sugar sized ls on top of the very thin layer i already had,so know theres about slightly less than 1" in total i tried putting it in by lowering the bag a cutting in the tank thinking this would allow the sand to settle fast ,WRONG it was a sandstorm after a few hours it has cleared and i have removed most of it from the lr everything seems fine,so was adding more ls a good idea ,i realize know that i should of asked before doing this,but it seemed a good idea at the time
2.i have two small percs and a six lined right know is adding another small fish going to tax the system to much in a 20g.
thanks for any input :)

[DEAD_BY_DAWN]

nearly forgot for feeding the shrimps and crabs (and corals from what i was told )i picked up some Cyclop-eeze how much of this should i be useing,per day and the fish i was ,well my roommate was considering getting even better ,was a Pseudochromis paccagnellae but will my six lined have problems with this combo