If you can find SAFE START in your area give that a try. Its made by tetra. Just make sure you buy enough for your gallonage.
I have been using this stuff for a couple of years now with every new tank set up. And it works great.
I trust it enough now that when I set up my little 125 I added the entire stock list the same day I set the tank up. Then dumped in 2 bottles or enough to treat 150g. And tested daily and all I ever seen was a .25 nitrite reading for 2-3 days. Never seen a ammonia reading.
If you truley beleive that your bio load is too much for your biofilters suface area. Then you might try switching or adding some ceramic media. It offers the largest surface area per space used out of all the media's.
Good luck
I have been using this stuff for a couple of years now with every new tank set up. And it works great.
I trust it enough now that when I set up my little 125 I added the entire stock list the same day I set the tank up. Then dumped in 2 bottles or enough to treat 150g. And tested daily and all I ever seen was a .25 nitrite reading for 2-3 days. Never seen a ammonia reading.
If you truley beleive that your bio load is too much for your biofilters suface area. Then you might try switching or adding some ceramic media. It offers the largest surface area per space used out of all the media's.
Good luck