Romaine being as bad or not so bad as iceberg lettace aside, it is never good to feed just a single source of veggies. Best to use as much a variety of greens as possible. Romaine is no good as a stable green, it doesn't have enough nutrients for a bearded dragon to remain healthy on. Good staple greens are collard greens, dandelion greens, endive, escaroli, mustard greens and others. They need a variety, at least 2 staples plus toppings of bell peppers, carrots, peas, string beans, dandelion flowers, other editable flowers, non citris fruit etc. as well as insects (again variety of insects works too). How much insects depends on the age of the dragon. If over 14 months than 2-3 feedings of insects a week is fine, or a small amount every day (about 10% of their total food intake). Good insects are crickets, silkworms, butterworms, various kinds of cockroaches, hornworms, superworms (in moderation) and those new pheonix worms (which appear to be the larvae of some fly).
Front leg paralysis usually is caused by MBD, injury to leg or upper spine, possible uppper digestive system blockage. If your dragon is eating fine, give him healthier foods, dust insects with calcium containing vitamin D3, and if possible (ie weather is nice enough) take him out into direct sunlight for a half hour to hour a day. Also, take him to your reptile vet as soon as you are able.
If his condition gets worse following the above suggestion, take him to any vet experienced with reptiles, even if you have to drive a few hours to do so. Dragons can fail fast if they are realy sick, since they tend to hide their symptoms quite well before you can notice them.
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PHLdyPayne