I recently converted my 29 gallon tank to a 75 gallon and was curious if I have enough fertilized substrate:
I transferred the gravel from my 29 gallon which has been running for over a year. I don't remember how many lbs of gravel this is (about a 2.5-3" layer for a 29). Laterite was added to this gravel upon setup of the 29 (pack for 20gals from Aquarium Pharmeceuticals). I then added one 15lb bag of SeaChem Flourite and then an additional 20lbs of plain gravel.
I then tranferred and planted 10 mangroves and 3 Crypt ciliatas. I also have java moss and fern growing epiphytically on driftwood. I received my shipment of crypts yesterday from mailorder and planted them-6 Crypt cordatas and 2 Crypt griffithii. The new crypts look like they are going through the shock period as of this morning, so I hope they will recover soon and put up new leaves.
I just wanted to make sure that I do not need to add additional fertilizer like flourish tabs. I have seven fish currently in the tank and feed them twice a day with flake food. Gravel depth in the 75 is about 3".