Ghost shrimp can harm bettas, I've witnessed it. Go with red cherry shrimp. They should be cheap and they breed easily, so it won't matter if your betta snacks on them. Yes, acclimate them like you would a fish, they eat leftover food, algae (for the RCS), and microscopic organisms. For a 5g with a betta, you could only get about 3-5 ghost shrimp. You can easily put 10 RCS in that tank along with the betta. I'd say RCS is the way to go. They're fun to watch, colorful, and they are very interesting creatures.
I strongly agree with Kiara! My ghost shrimp attacked my betta.
But if you do get them, here are my responses.
1. Yes, I would acclimate the shrimp by floating the bag in the tank just for 10/15 minutes
2. Yes, they can. Rip shreds of their fins.
3. Bloodworms, they would eat my betta flakes, pretty much everything.
One even ate my algae wafers.
4. I had 2, but you can go with 3.
I have a 5gal fluval spec V and have 2 African Dwarf Frogs and 1 betta. They get along perfectly. However, my betta is super unaggressive and never flares at them or anything. So my betta doesn't bother them at all. My betta will even share food with them :)
I'd recommend 1 or 2 frogs over the shrimp. Just be really careful about the water conditions since froggies are sensitive to it.
Oooh, I think like six states have the cardinal. I'm guessing Illinois since I used to live there :p
How did you hand feed the ADFs? Did u just hold the food in your hand and follow them around? Cause mine always run and hide under something :(
Still, I started with tweezers. Then, seeing as how I'm ALWAYS around my tanks, they're used to seeing me. I tend to stick my hands in the tanks a lot too. lol *guilty* Still, they just got used to me.