i bought a bunch of rock at mylfs and they say all are ok for the salttank, some say algae will be a problem i have all arranged outside of the tank now and it looks real cool, so id be a little disapointed if icant use these, i was gonna silicone em together after i file some smooth edges so they will take the silicone does anyone have thoughts on this? i will rinse all before adding to the tank as well