Dry-stall vs Horticultural pumice ... was algae and moss in seedling pots
Alberto Castillo (Wed, 01 Feb 2012 10:55:10 PST)

Provided all are seedlings and sanitary conditions reasonably good why not put all those small pots in a tray with no holes and water from BELOW. The right amount to pour in can be easily adjusted and moss will have less chances to take over.