Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Otocinclus love diatoms.
Silicates in the sand /possibly dirt as well, will feed the diatoms till the silicates are mostly consumed.
Twice weekly water changes can help a little, along with keeping filter material cleaned in old tank water you remove during the water change.
Diatoms are easy to wipe/rub off broad leaf plants with your finger.
Keep glass cleaned with clean paper towel folded into fourths.