The more plants the better, but three or four bunches would be a considerable help, especially of fast-growing stem plants, such as Elodea, Hygrophila, Hornwort etc, or Indian Fern.
Jewel Cichlids are quite big, and messy eaters. Also can be very intolerant of tankmates, so shrimps and otos are out of the question. Some snails might help with the uneaten food debris that cichlids tend to leave. Possibly Malaysian Burrowing Snails, as your Jewel is less likely to kill them compared to some others.