Looks like you're off to a good start. I agree with the others, when they say to add some more live rock. This is not only to provide adequate shelter for any species introduced, but also because live rock in and of it's self, is one of natures best filters. Sure, it can't remove detritus, and no, it won't circulate your waters, but it will filter them, removing harmful chemicals, and it's tiny inhabitants siphoning out particle matter suspended in the water's column. Additionally, it's surfaces provide not only numerous nooks and crannies for smaller inverts and plants, but it will also provide you with the surface space required for those corals you're talking about.
Look into "nano corals".....No, they aren't a special breed of corals made specifically for 6gal's, but rather, species of corals that possess one or more of the following characteristics - self regulating based on available space, slow growing, positively responsive to fragmentation, low lighting requirement, smaller species as a whole, colonizing - meaning that it's not just one animal, but many - reproduced asexually, accomplished by a number of different methods including runner formation, fission, colony fragmentation, or budding - making them easily sustainable in a tank where a "partner" coral may not be feasible.
Check the sticky on Soft Corals 101.
I would advise strongly against any hard corals as the lighting requirements for such would be quite difficult to reasonably provide in such a small enclosure.
Additionally, always keep in mind the balance of organisms. While you may not be in the need of typical cleaning crews, as larger tanks require, it would still be wise to invest in at least one or two snails - which will keep your algae in check, as well as a benthic invert, such as a smaller variety of crab. These little janitors work wonders on picking up forgotten pieces of food, and sift through sand beds, keeping them well aerated, as well as nibbling on waste matters.
Additionally, as you fill the tank, make sure that you allow for proper water movement. In a tank that small, ammonia and other harmful toxins can build quickly, and stagnant areas build waste and lack oxygen.
Good luck and keep us updated.
Look into "nano corals".....No, they aren't a special breed of corals made specifically for 6gal's, but rather, species of corals that possess one or more of the following characteristics - self regulating based on available space, slow growing, positively responsive to fragmentation, low lighting requirement, smaller species as a whole, colonizing - meaning that it's not just one animal, but many - reproduced asexually, accomplished by a number of different methods including runner formation, fission, colony fragmentation, or budding - making them easily sustainable in a tank where a "partner" coral may not be feasible.
Check the sticky on Soft Corals 101.
I would advise strongly against any hard corals as the lighting requirements for such would be quite difficult to reasonably provide in such a small enclosure.
Additionally, always keep in mind the balance of organisms. While you may not be in the need of typical cleaning crews, as larger tanks require, it would still be wise to invest in at least one or two snails - which will keep your algae in check, as well as a benthic invert, such as a smaller variety of crab. These little janitors work wonders on picking up forgotten pieces of food, and sift through sand beds, keeping them well aerated, as well as nibbling on waste matters.
Additionally, as you fill the tank, make sure that you allow for proper water movement. In a tank that small, ammonia and other harmful toxins can build quickly, and stagnant areas build waste and lack oxygen.
Good luck and keep us updated.
