Q.ixoria plants
I have 3 ixoria shrubs 1 is dark geen leaves but no flowwers the other 2 the leaves are turning yellow what am I doing wrong

I believe your yellowing leaves may be a nutrition issue. More specifically the ph may be off in your soil
Ixoria need a ph soil level below 5.5.
Your local County Extension Office can help you with a soil and ph test.
Here are some articles that will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/ixora/growing-ixora-shrubs.htm
http://university.uog.edu.172-31-22-36.previewmywsisite.com/cals/people/PUBS/ORNAMENT/MG09200.pdf
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm