The pink splotches you're seeing on the silicone seams do sound like coralline algae. That's a good sign, as it indicates your tank is moving in the right direction towards a stable environment suitable for fish. Coralline algae generally starts as pink or purple patches, so keep monitoring their growth.
The addition of beneficial bacteria can speed up the cycling process, but it’s vital to verify your parameters before adding fish. Check that ammonia and nitrite levels are at zero or undetectable, with nitrates under control. This indicates a completed nitrogen cycle.
Running your lights on a 24/7 blue LED cycle might not be the best approach. It can lead to unwanted algae growth, and while coralline algae can grow under blue light, a regular light cycle mimicking daylight would be healthier for your tank ecosystem. Consider dialing back to an 8-10 hour light cycle.
Finally, before adding fish, ensure you acclimate them slowly and maybe add them gradually to prevent a spike in ammonia as the biofilter adapts. Keep testing the water regularly to catch any potential issues early. Take it step by step, and you'll be on your way to a thriving tank.