Hi, nice thread and nice jar!
I'm gonna give my two cents based in the experience with my bowl.
- Lid / air pump / gas exchange.
There's a lot of information you can read about.. and they will tell you, this is not going to work. But my experiences showed me the opposite. If you are pumping air inside, you are already promoting some air exchange and water movement. In my case, I removed the air pump and I left only a wave maker. Evaporation is really heavy, condensate in the lid and drip back to tank. for me the key was water movement. The air bubbles were kinda of a skimmer leaving the lid nasty. Parameters are all good.
- worms
For me, all of them are good. Exception is the fire if you really want to go full sps.
The bristles, spaghetti keep them all. If you don't have external filtration like me... you need somebody to eat the organic mather. None - except fireworms- will eat corals or shallow stuff like an anaconda... maybe in several months the population will be very big and you can take some one with pliers... but if some of them die , the others will eat. The key is to have an ecosystem. Maybe get a arrow crab to control the population while they are small. I just think that a top layer of fine sand would help to develop more biodiversity. Course sand will prevent some creatures to develop.
- crabs / cuc
Great you bought that crab. He will help lots with the algaes, specially diatoms in the beginning. A nassarus vibex would be a good addition too.
- Glass cleaning
keep in mind your glass will host a lot of copepods and other good similar creatures - as you dont have much rocks. If you scrap off all that algae religiously... their food supply will be limited too. Clean it when you receive visits at home lol
I never made any study to confirm but I believe that aquariums with minimal quantities of rock tend to have more algae problems due to lack of surface to host and develop beneficial bacteria and creatures who eat algae like pods. So.. maybe think about some additional rocks. It won't make any harm and can create levels for more or less light demanding corals.
With all due respect, I hope this helps! good luck and keep posting!