Any special instruction on removal? Want to make sure muriatic acid does stick around and harm livestock later.
I run my powerheads in a bucket filled with 4:1 (water:MA) solution every now and then. I keep them in there for just a couple minutes, and all the coralline wipes off like nothing at all. They look brand new again, just like NIB. Afterward, I rinse the powerheads under the kitchen faucet for a minute to rinse them off, then fill the sink with water, and run the powerhead in there for a few minutes. It would probably be a good idea to run them in some RO/DI afterward, but I never do, 'cause I'm lazy. So after the sink run, they're back in the tank for me.
I do this same thing with the Kent float valve that holds back my kalk topoff, as well. The kalk buildup sizzles off in a matter of seconds, then I run it over to the sink and rinse it off and scrub it all with a wash cloth.
On the occasion I clean my HOB skimmer (AquaC Remora), I set the skimmer on the edge of the bucket of acid, and drop the feed pump down into the solution. Because of all the nooks and crannies in this skimmer, I make sure and rinse it out especially well, though.
Muriatic acid is one of those things I keep as "standard stock" all the time now.