If you are going hood less can I assume that you will have a lid of some sort? I could recommend having a lid because some fish are jumpers.
There are all sorts of alternative hood lighting, but I unfortunately am not very knowledgeable about the alternatives. I have always had hoods on my tanks.
First off I would recommend getting rid of your Chinese algae eater. They get big and aggressive! If you want a fish that will remain a decent size and be an effective algae eater I would recommend getting otos or a bristlenose pleco. I have had both and I prefer bristlenose plecos (awesome for algae)!
Are you planning on getting rid of your 10 gallon tank? I would recommend keeping your betta in the 10 gallon, because then you have more opinions for stocking your 30 gallon.
Some people believe that bettas get stressed living in community tanks because of fish movement, other fish nibbling on fins and fighting with other long finned fish (mistaken for other male bettas). While other people believe bettas can be totally happy living in a community tank. Food for thought!