Hi, advice you on how to treat white spot 1st. Change all you water and apply 20g salt into new water, and those affected, please remove it and let go...

2nd, talk about easy fish... emmm... I think Guppy, ya its easy.. to me at least. Ok, nothing easy. If you can maintain water condition, if you understand what kind of environment suitable for your preferred fish, then its easy. eg. gold fish best live in pH7.0 ~ pH8.0, temp about 26 ~ 30dc. Then guppy, pH6.5 ~ pH7.5, temp about 25 ~ 28dc and etc.. and always take extra care on water treatment, clear water doesn't mean good water, ok!