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Foreground Anubias nana- not very many carpets for low light maybe Java moss
Mid ground- crypts, java fern
Background- cambomba, myrio, wisteria, anarchis
Not sure what you mean by centerpiece, some Anubias nana or java moss on DW would be cool
I told you, there are very few low light carpets, they tend to grow up instead of out in low light. You could try a moss such as java or Christmas moss.
You can not put clown loaches in a 29 gallon. Not small ones. Not any size. Never. 50 gallon minimum for small ones, and you need at least a 4 foot, preferably 6 foot 120 gallon minimum tank. You also can NOT keep them in pairs or trios. Schools with a minimum of 5 for ANY kind of loach. And dojo loaches are coolwater, you can't keep them with tropical fish.