Pink particles randomly spawn in the world. (Usually in huge chunks underground). They went away after removing the mod.
I did test with just this mod and it did not have this issue, so I am aware that another mod must be involved.
Before I try to find the other mod I was wondering if you knew what might be causing this as it is very odd.

This is likely caused by modded ores spawning particles. Antixray uses them to obfuscate xrayers sight. The default config include c#ores, which includes all ores. You can manually list ores instead to ensure the ores with particles are not used!