I am not sure why you want to spend $600.00 for a pump for a 2" long, $25.00 fish but that's up to you.
After saying that, I don't feel your tank will be mature enough for a mandarin for a year or better two. I have been keeping and spawning them since they were invented, and I feel they are one of the easiest, healthiest, least care, long lived fish there is.
But, your tank needs to be right for them. A very clean tank with white rocks will kill them no matter how many pods or frozen food you add. A mandarin is a type of fish sort of like a pipefish or seahorse and lacks a real stomach so it can't store much food and needs to eat a small amount constantly and it doesn't care if you can't provide that way of living.
They eat pods or any tiny creature, and they want to eat one about every ten seconds all day long.
I invented this feeder that would dispense new born brine shrimp all day, but I wouldn't rely on this solely.
Healthy mandarins will constantly spawn.
The fish needs to be in a tank where there is growth on the rocks. A lot of growth is best. Like this.
Two males will constantly fight until one is dead. They are easy to sex. The female is in the front with the rounded dorsal fin.
They also hide most of the time so need tunnels with caves and "natural" hiding places where you can't see them, not a big cave in the middle of the tank. Multiple passageways through the tank.
I have a pair now and sometimes I can't find them for a few days. They like to stay out of sight.
The first time I saw a Mandarin, I thought they were fake because that was the 70s when everything was "psychedelic" . (google it if you are under 60)
Good Luck