New hobby is growing...

Don't mean to be a bummer, but there are some things you should be aware of when pairing clowns. If you purchased 2 adult clownfish separately, there is a chance they could both be females. If that is the case, they will never cohabitate peacefully, and it could be the reason they now occupy opposite corners. To successfully pair clowns, you need a male and a female. This can only be accomplished in 3 ways that I know of. You can obtain an known mated pair. This is the best and least risky option. The other 2 methods both involve risk of incompatibility and death of the less dominant fish. The second best option is to start with a known female and pair it with a much smaller juvenile that has not established a sex yet. If the female accepts the juvenile and doesn't harass it to death, more than likely it will become a male. The third, and most risky option, is to start with 2 juveniles and hope that one becomes a female and the other becomes a male.

I'm strictly speaking from my experience. There are probably others with more experience that will offer differing opinions. But I do know that putting 2 adult female clowns in the same tank is generally a recipe for disaster, unless you have a very large tank. They may look cute and peaceful when they are small, but there are very few fish that are more aggressive and territorial than a fully-grown female clown. It's the only fish that has ever bit ME when I put my hand in the tank.

 

This has been my experience as well. And once one started biting it didn't take long before the other joined in. And these were ocellaris clowns.

I don't think you can actually get a maroon and an ocellaris clown to "pair" even if one is male and one is female. I also don't want to be a downer, but I have a feeling that your ocellaris is doomed if left in there long term.

There's a pretty good write-up archived on RC... hopefully posting it isn't violating any GIRS rules.

Keeping clownfish: multiple clowns and mixing species - Reef Central Online Community Archives

 

Again there are likely others that know more about this than I do, but I think it is highly unlikely that a maroon and an ocellaris would ever pair up since they are a completely different genus and species. Also, the maroon is one of the most aggressive fish available. A fully-grown female will not only dominate other clowns, it might attempt to dominate other fish as well, and control the entire tank. Maroons are well known to get big and mean, so separation will probably become necessary in the not-too-distant future. I have also had many freshwater tanks and have found out the hard way that you can't get away with bending the rules as much in the saltwater world.

I hate to be such a downer but you can learn a lot from other people's failures in this hobby and avoid those pitfalls yourself. I wish I had listened more to other opinions when I first started out. I could have saved myself a lot of time, money, and headaches.