Flourish Tabs - substrate depth
Hi, I have 3 questions regarding Flourish Tabs.
At the shallowest point, my substrate (mixture of Flourite Black and inert black sand) has a depth of about 3 cm (just over 1 inch). Is it ok to use the Flourish Tabs in these areas of the tank? I'm worried that because the substrate is so shallow, nutrients could be leached into the water column.
Also, how quickly do Flourish Tabs dissolve? I have a tendency to rearrange my aqua-scape often. I'm scared that doing so would disturb the Tabs, causing a nutrient spike and algae bloom.
I plan to plant mostly hairgrass. Would you recommend Flourish Tabs or Flourish (liquid form) for hairgrass?