Salt creep is generally not a good idea to knock back into the tank. It can raise your salinity depending how much you knock in, also any undissolved salt that lands on a coral will burn the coral. Ive had a few run in over the years with chunks of salt creep falling on corals and burning them.
Its best to tank a clothe wet with rodi
and wiping down any surfaces weekly were salt creep is building. This helps prevent salt falling into the tank eventually. It only takes salt landing on coral for a few seconds to burn it.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.