I have a new 90gallon fish tank with a few fishes. I recently got my first coral frag and started noticing web like stuff in the tank. After reaearching it is due to vermitid snails. I removed all rocks and kept them in the sun. The tank now only has fishes, sand, heater and wave maker. I still see new web stuff. I can’t even spot them ANYWHERE. PLEASE HELP ON HOW TO GET RID OF THEM. Should I remove the sand and live it in the sun dry? My tank looks soo dirty already.