Yes and the sea floor is calcium rich to be sure, but if the shells and calciferous structures in living organisms are compromised on a large scale this could mean some rapid and destabilizing change for every organism on the planet. The earth is dynamic and won’t maintain anything forever, but we as a species need to make sure we have options for our long term survival.
don't worry about ocean acidification as the CO2 when reaching super concentration is incorporated into calcium carbonate of shells
https://co2coalition.org/wp-content/uploads/2021/08/Ocean-Health-White-Paper-REV-061120.pdf
Discussion
exploring the galaxy is an excellent use of our resources. especially if many of the resources found in the galaxy can be returned to earth making the cost net neutral or even a net gain