Hmmmm...
Ok so a few things. First, if it was their first go then Romeo may not have been up to his task the first time out. If it happens again then it's time to have a heart to heart talk with him and get her a new mate ;-)
Second - the eggs appear to be unfertilized. Viable, fertilized eggs can turn white too as fungus spreads to them but those eggs are not showing that yet, I assume this was 24-36 hours after spawn? longer and they'd show cottony growth.
Breeding Angels in a community tank is tricky. If you are content to eventually have them raise a handful of littluns naturally for the heck of it just keep doing what you are doing.
DO NOT use Methylene blue in that tank! Other fungicides (I always stuck with Maroxy but hate to put anything in my show tanks) that won't wipe out the bio-filter and stain everything would be better. MB is excellent, it also stains like crazy - the silicone at your seams and everything else.
Here is a suggestion.... put the expensive hi-tech breeding surface I use in the tank (4" clay flowerpot, $1.99). I boil them after each spawn has hatched and swam away and once before I ever use it in case I get lucky and one has a bad chemical in it. Eggs and wigglers stick to them very well.
When one of my pairs lays I wait about 30 minutes then pull the pot out and stick it in a 2.5 or 5G hatching tank with water from the breeder tank. I use the pot to hold down an airline so that the airstone is 3" or so from the pot, egg side facing air bubbles, and get a nice steady stream of bubbles to keep oxygenated water circulating over the eggs but not a real turbulent stream, if some eggs start to pull off then too much air. Leave the eggs that come loose alone, if they are viable they will be fine.
I keep my hatching tanks at 80 or above - my garage is hotter than 80 most of the year so ambient temp works for me in Texas. I add a half cap of Maroxy or drip in some Methylene Blue to keep fungus from attacking unfertilized eggs and spreading to the viable ones - happens in a flash with warm water. Couple days later I have wigglers and couple days after that I have free swimming fry. I give them live baby brine or newly hatched Moina once they are free swimming. After that first feeding I siphon NOT NET them into a pitcher and into a 10G with a sponge filter.
So... we may have different objectives. You may think "Wow, it would be cool to watch them raise some fry and see some little angels in my tank".... and you would be absolutely correct. I am after 98% hatch/survival rates and 300-800 fish per spawn. It all depends on what your objective is but this should help you a bit.
Good luck!
