Your moving along quickly!!!
Maybe this thread should be moved to another forum. I kind of got off track.
I don't know about that. You, the OP, can edit the title of your post is you desire.
If you find the water is still too cold, you may be able to take a very long stretch of that black hose and coil it around and around, laying it flat, before it goes into the tub. Being black and the further it goes will help warm it. Possibly lay it on a black sheet. The more the sun can warm it up, the better.
You might also be prepared to have a cover ready to go. Critters like a free meal!!!