Cobalt is also a good food, I don't feed my convict blood worms but I do feed my community tank frozen Hikari blood worms once a week or one every 2, blood worms are super high in protein so overfeeding can indeed cause constipation , also bloodworms can cause more aggression cause of the high protein so I've heard not 100% sure .
I would get a good brand pellet food like Hikari, Cobalt, omega one and the ones previously mentioned by Hukit