Angelfish nest in 75 gallon?

I'm pretty sure but want to be certain about this, I'm guessing these are angelfish eggs as 2 out of the 3 angelfish in the tank are protecting them but i didn't think they would lay them on the glass?
If they are, I'll hopefully have some fry. I do have a 15 gallon empty i can get setup but I'm not sure i want to move the eggs...any advice is vary much appreciated.

 

Yes they are angelfish eggs, I think it is reasonably common for them to spawn on the glass. They tend to use a vertical, or near vertical surface. Sometimes the parents will eat the eggs or fry especially the first few times. People often do remove the eggs and place them with an air stone close by and sometimes add methylenes blue to prevent fungus. But you can’t do this as they are on the glass. In any case my preference would be to let the parents have a go, and if the fry get to free swimming then you could remove some to rear safely if this won’t be possible in the main tank.

Sometimes two females spawn together, if this is the case the eggs will turn white and/or disappear in a couple of days.

 

I'll keep a close eye on them. Im not sure how to sex them but if i do end up with fry, i have a 15 gallon i can move them too if necessary. Might keep 1 or 2 but, if more than that survive, I'll probably sell some on here or to my lfs. One is yellow and the other is silver with a blue tint and black stripes. Do they fry come out one or the other? or do the colors mix? I think yellow with black stripes would be interesting.

Edit. Here is the whole tank

 

I don’t think you get yellow with stripes, there is a lot of info on angelfish genetics and what different colour combinations produce. I think knows about this and may be able to tell you how they would turn out.

Good luck with them.

 

Assuming the male zebra is a blue zebra with the pb trait, and the female is a gold,
100% of the fry will be silver zebra and none will get the gold or the pb traits to manifest, the zebra trait will override as dominant, the offspring will have them as recessive genes though in the background.

It's a good outcross if you wanted to eventually get to silver blues by inbreeding them a couple generations to solidify the recessive traits again with the offspring, but the offspring will all be silver zebras on this generation and won't have the blue or the gold.

 

Assuming the male zebra is a blue zebra with the pb trait, and the female is a gold,
100% of the fry will be silver zebra and none will get the gold or the pb traits to manifest, the zebra trait will override as dominant, the offspring will have them as recessive genes though in the background.

It's a good outcross if you wanted to eventually get to silver blues by inbreeding them a couple generations to solidify the recessive traits again with the offspring, but the offspring will all be silver zebras on this generation and won't have the blue or the gold.

Honestly, this was all a "happy accident " to begin with. These guy's weren't sexed when I got them but I'm pretty sure the female is the gold. I'm working on setting up a breeding project for my albino bn pleco but, i guess I'll be starting with these guys lol. I'll probably have to move the female long-term to another tank to lower aggression in this tank. I believe they are wiggling now. It's been about 3 days . I first noticed them Thursday night. I'll probably sell this first round of fry off if they survive.
Thank you for taking the time to respond. I greatly appreciate your info as it was incredibly helpful.