My tank is around 29 gallons (110L) and today I put in it 5 bunches of Vallisneria. I also got some plant fertilizer in the form of JBL Ferropol.

Now, I was wondering as I have amano shrimp should I follow the recommended dosage on the bottle or shall I reduce what I put in? The store owner said this fertilizer is shrimp safe but it does contain trace amounts of copper which is worrying me.