Tiny crawlerz

[pisces 12]

I've had my 300gal tank running without lights and using lousy water replacement for the past 4 years one fish ,anyway 3 weeks ago i revamped the hole syztem all new RODI filters carbon phosgurd new T5 and led lights PM KALLWASSER REACTOR TUNZE ATO SOME NEW Sand etc all water levels are all good also have live rock with no color due to the lights being of for a long time , my question is i now see tiny pin head like snail's crawling all over the tank ,a day ago i added 4 bottles of live pods and some phytoplankton what is crawling on my glass been out of the hobby for a long time so dose anybody have any ideas:

 

[sde1500]

Likely some copepods and amphipods

 

[devimik]

The tiny snails are likely Collonista snails - reef safe.