Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Me thinks with substrates like sand and or the black diamond most everything remains on top of the sand, which might otherwise drift down through fine gravel,or rounded substrates like aqua soil to the lower region's in addition to the nutrient content they might have from the outset.
Root tabs are best for rooted plants in sand, where they might not have ready access to dissolved matter that they might be able to turn into food's.(remains on top )
With that said however ,I believe over time (month's) that some dissolved matter will make it's way to the lower regions of any substrate but would still hedge my bet with root tab's .
Seldom see tanks/substrates that are left to mature before they are torn down for whatever reason's. IMHO
Should also mention that I have grown lot's of sword plant's and crypt's in just sand with root tabs and no water column dosing and thought they looked good, and noticed even better performance once I adopted routine water column dosing also.
Last edited by roadmaster; 08-24-2017 at 04:24 PM.