Opportunistic feeders, their diet varies from one region to another. In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. Killer whales in the Bering Sea (near Alaska) eat about 65% fishes, 20% squids, and 15% marine mammals.
Even though your shower grout looks dry, using it too early or sealing it before it's ready may damage it, leading to premature failure. Most cement-based grouts require a cure time of 48 to 72 hours before applying a penetrating sealer.
After grouting is complete, clean all tools to remove grout before it dries on. Keep people off the freshly grouted floor for 24 hours. You may also want to seal the grout lines and or tiles if they are in a wet area or may be prone to staining. Wait about 72 hours after install before applying a sealer.