The paint I used on my tank was a 2 part epoxy paint that is certified for pottable storage.  It is the same paint used to coat the inside of water towers.  The smallest amount you can buy is 1 gal. and it costs around $40 and up.  It also only comes in white but it can be tinted.  The only problem when they tint it, they will not garantee it is still safe.

One thing I have heard of people doing to hide their white pvc is to use the purple primer for pvc to paint the pipe.  This might work for the hold fast but I agree with Jeff and Jon, it will change colors by itself naturally.

There is a reef safe two part epoxy and then there is superglue. Both of these are completely safe for marine fish and invertebrates. The claim by a manufaturer that a product is "aquarium safe" cannot be trusted at face value. Most aquariums are freshwater and do not house marine invertebrates or marine algae. Can you tell us more detail about this aquarium safe glue. Full name, manufacturer etc. I know of a marine paint that claims to be good, but it can also flake off of some surfaces. I am with the rest. I would never put paint into my reef aquarium. There is a painted plywood tank in our midst. Perhaps Keodog will chime in here.

Please forgive me for writing this. I don't want to offend you, but it appears to me, after reading your other topics, that you have done some things a little differently. This could lead to later problems with keeping things alive. I am pleased that you are asking questions here. I believe that you may benefit from asking us what to do next, before you do things, if you want to avoid something that costs needless money and even organism death.

No one else cares quite like we do. They don't have the time. See my signature line below.