Spawning this species is so much fun...a bit of work and maybe a little money depending on what you have and the method you want to try and...success......
I have 2 methods that have worked well for me, there are lots of good methods too, but these have worked best for me.
Bare bottom and heavy planted both in a 10 gallon tank and I like to use a full tank of water, I keep my breeders well conditioned so I don't worry about them getting to tired with a full tank of water during spawning and after care.
I keep my breeders conditioned with my homemade food and lots of live food, one week before I plan to spawn I put the female in my guppy tank so she can eat all the guppy fry she wants and I will feed the male breeder guppy fry daily along with mosquito larva the week before spawn.
I found that good conditioning will get me healthier stronger eggs, then wiggles, then fry and I have very few fallers, once the eggs are in the nest they will rarely fall.
I found I get best hatch and healthy wigglers/fry in water temps of 80F, they will hatch within 24-28h, when I use higher temp the eggs tend to hatch too fast and the wigglers are a bit weaker.
I like the planted tank method the best and I also keep lots of ramshorn, pond and trumpet snail in the spawning tank and the reason I like this method is for the natural infursoria development a great first food once the fry are free swimming. With plants you also get all kinds of good micro-critters for fry food and good hiding/resting places for the fry
I feed the fry at different stages of growth and development-infusoria, daphina, seed shrimp, NHBBS, supplemented BBS, mosquito larva, white worms, I don't feed any dry or homemade food until they are moved into the grow-out tank at about 6-8 weeks.
I make daily 50% water changes on the fry tank once I start feeding or adding live foods, usually by day 2-3 of free swimming stage and this is when I remove the male unless I am doing a multi spawn
I remove the female right after spawn unless it is a multi spawn
I cover the top of the 10g tank with a plastic veggie wrap after I remove the male or at least by week two so that I can keep the air above the water warm and humid for the fry first breath at 3-4 weeks.
I move them to other tank as per their growth and development, you almost always will have some that out grow the others. The 30g tank you have will be perfect for grow out.
When I cup them I use pint size canning jars and make 100% daily water changes and feed the heck out of them to get healthy body and fin growth. Mine are near full size and fining out by 10-14 weeks...the runts a bit longer...lol......