That's prudent and something to plan for agreed, the annoying ones are green hair algae and aiptasia. Just like cycling has different approaches (wait and test for 30 days all rocks, vs some rocks verified as skip cycle) there are different ways handle and view live rock or new tank invaders
A plan for the uglies -
Cycling has always been just about bacteria. It’s never about letting ones tank fill up with cyano, or GHA, we have matured tanks undergoing those problems right now in the invasion help forums so it’s no exclusive domain for cyclers that’s for sure.
Articles we can source right now devote a third of the material to advising we should allow the takeover, the advice has been a staple for nearing twenty plus years
But like live rock skip cyclers, a very small portion of reefers simply break rank and do not accept or comply with the uglies phase. they want their investments to always look nice-to not have to make excuses to all viewers for eleven months etc
when algae appears as it should on reefs (feeds grazers in the wild. Not a sign of bad params, gha is a sign of allowance only, like someone who allows their yard to take on all dandelions) it’s possible for you to just lift up the rock and kill it, stop the takeover, and set the rock back. Clean, instead of working through the water, which isn’t implicated as trouble during algae challenges, we can work directly on target where simple allowance is changed to disallowance
How to kill it? Get creative. I’ve used blue jet flame lighters to burn algae off. Sometimes a knife tip digs it out, with a blip of peroxide to kill anchors (all done externally, not through the water) if you have a clean up crew working then you won’t be cheating to stay clean, but if they get lazy you have a choice on how to garden your rocks. Allow or disallow. Reef tank invasion is a choice before it’s a biological matter, a yard being wrecked with weeds is a choice not a requirement.
**live rock has another powerful advantage over all cycle starts: inherent biodiversity that stops dino invasions
If you start with anything other than live rocks, real prior submerged live rocks, the risk of dino invasion isn’t just possible it’s elevated risk and those are top horrible invasion in reefing currently. Seawater might have similar suppressive effects that’s untested though
True live rock with growths and living projections is nearly immune to dino invasions, that’s a neat benefit for Richies tank