There are fish in the tank. I am using Seachem Stability to help cycle the tank. Here are my stocking plans:
1x Clown Knife
1x Gold Severum
1x Fire Eel
2x Datnoids
1x Jade Sleeper Goby
7x Clown Loaches
5x Silver Dollars
1x Leopard Ctenopoma
1x Ornate Bichir
1x Blood Red Parrot
1x Geophagus
I own all of these fish right now (just finished buying them this week) About half of them are in the 300g to help cycle it. This is my final stock after thinking about it with blood, sweat and tears.
Too bad you already have fish in the tank.
You could have guesstimated your bio load and added ammonia for a fishless cycle, 2-4ppm, and found out if you had sufficient media.
Good news is the media you have now will become populated with bacteria, along with everything else that comes in contact with your water.
Have to assume a few things.
You are not going to dump a bunch of fish into a tank until you get a 0 reading on ammonia and nitrite, along with a raise in nitrate.
I mean, your tank will have cycled before adding all those fish, right.
Putting a big load of fish into even a fully cycled tank, will cause you a bit of bother.
A couple extra WC until the bacteria can grow to handle the larger load.
You might need more media, you might not.
Only a series of tests will tell.
You could add a bunch of media which in the long run will be unproductive, but will not hurt anything either.
My experience is the bacteria find a way to grow large enough to consume the food.
They don`t care if they are growing on media, rocks, gravel...yadda-yadda.
So, in the end, if you want to add more media..go ahead.
If you want to keep the same amount and do some testing, that would work as well.
Strictly your call.