or it could be that they just aren't good angel parents.... some of them just aren't and may never be. If you wanted to raise them, you should have a cycled tank nearby for the eggs once they are laid. Since this time, it's on the intake tube and assuming you don't have another tube available, try placing some slate in the tank and place on a slight incline. Once they lay the eggs, remove out of the tank and into the cycle tank. In there, you should have an airstone to keep water moving over them and meth. blue to protect from fungus. The remain as eggs for a few days and then the angels emerge as wigglers. When the pass this stage into free-swimmers, you need to provide them with baby brins shrimp so a hatchery will also be needed.