Glow squid not spawning

Glow squid are not spawning anymore on my realm and other realms i have been too.  My base is under ground almost close to bedrock at y level -54 and my friend has a base underground too. She lives in a lush cave. We use to get tons of glow squid spawning and we have notice that they do not spawn anymore even doe we follow of all the glow squid spawning rules.