Anemones, possibly chiller, You want the water under 80F. I cannot comment upon if it is necessary without the tank running. IE: You may keep the AC low enough not to need one. Lights? Oh yeah for anything other than a condy you will need powerful lighting as about 90% of their needs are met throug hphotosynthetic algaes living within their tissues.
FOWLR. You could try a few soft corals such as green star polyps, leathers, or mushrooms. Problem is many fish will pick at them. Also a problem I have with the idea of FOWLR is that they generally end up as pathetic reefs. Most good FOWLRS are that for a reason, aggresive fish. A well thought out FOWLR contains eels, lions, groupers, triggers, Angels (they eat coral).... and no corals of any kind. From my experience people that say that they are going to set up a FOWLR with "peaceful" fish simply cannot resist buying a few corals. If there is any chance you might want corals just build a nice reef instead. It will actually be cheaper to buy what you need than to keep replacing it as you "grow into it".
The cleanup crew should live on forever unless a particular wrasse enjoys eating them. As long as there is food to eat they will prosper and breed. they will break down heavy solids into smaller easier to break down wastes that the bacteria can process.
Bio balls..... They are considered a pain in reefs. They collect nastiness that is hard to clean. Being as they are difficult to remove and clean they are often neglected (kind of the same reason filters are no longer considered reef equipment. Skimmers are the way to go as they remove waste from the tank once and for all) and being neglected become nitrate factories. Most of the reefers I deal with have all switched to using live rock rubble in the wet dry area of the sump. Is it really better? Probably only in our minds. At least the rubble can allow micro organisms places to live that bio balls just cannot provide. I don't think a pod collection would breed as quickly in bio balls as they would in a rubble pile.
Refugium.... Provides an area to allow micro organisms to thrive. Allows a place for nursing injured fish or corals. Usually contains 3" of live sand or "mud". A handful or caulerpa or cheato macro algaes. Slow water movement pump in from the display tank. 24 hour lighting. A 10g tank can make a great fuge. Basically you are providing a place for algaes to grow wild. The theory being that algae allowed to grow in a confined space will use the available nutrients thereby making it impossible for lages to grow in the display tank. By leaving the lighting on 24 hours it prevents the CO2 buildup that would normally happen at night from non respiring algaes and corals. A build up of CO2 will cause the PH to crash at night. By removing clumps of the macro algaes as they grow you will actually remove the wastes from your tank that would pollute it. Some folks like to add Xenia as that stuff grows quickly and is easy to harvest. Also has some trade in value at the lfs. I keep a lot of shrimps, stars, snails and hermits in mine to help as well. I raised 2 frog fishes in mine until they were larfe enough for a tank of their own.