Do I thighten them all the way?

[Dtfnemo]

Thanks for all the help guys!!! I'm gonna still not sure what to use but leaning probably to the sealing compound

 

[P-Dub]

Silicone and you have mucked up the threads if you later need to take apart and re-install and you gotta get ALL the old silicone off before re-applying. I'm not sure what compound has been proven to be reef safe but your call. Bottom line, whatever you use, DON'T OVERTIGHTEN.

 

[Dtfnemo]

Silicone and you have mucked up the threads if you later need to take apart and re-install and you gotta get ALL the old silicone off before re-applying. I'm not sure what compound has been proven to be reef safe but your call. Bottom line, whatever you use, DON'T OVERTIGHTEN.

You know I think I'm going to have to get new fittings for the unions because I went full beast mode on some of them and I dont want to risk it.
First plumbing job ever so I really don't want to fail

 

[P-Dub]

You know I think I'm going to have to get new fittings for the unions because I went full beast mode on some of them and I dont want to risk it.
First plumbing job ever so I really don't want to fail

Failure is not good.