If you're going to keep guppies you have to cover the intake with a sponge prefilter, I use the one from aquaclear.
They give live birth and you're bound to have lots of issues dealing with that. If you keep your tank crystal clear with plants, then you just need to give it time. Diseases are very much connected to water conditions. Many fish that we get from our LPS or online usually have some type of parasite or diseases etc. Whether they show up or not would be very accountable for your water conditions as well.
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