Transfering algae to new tank when using filter gunk from old

[LadyDay]

Hi guys.

I have just started a new aquarium 5 weeks ago and have developed a Nitrite problem, which is bad because, long story short, I added fish a week ago, thinking the tank was done cycling (Initial Nitride spike had subsided, so now it has returned). Anyway, to remedy the problem and help the tank cycle I am considering taking gunk from the filter in my old aquarium and adding it to the filter in the new. However, I am hesitant because the old tank is badly infested with BBA. I am worried about infecting the new tank with BBA, which is super hard to get rid of again. Should I be concerned? Or can I safely go ahead and use the filter media?

 

[bazz]

What is the volume of the tank, how many and what kind of fish have you added, if the tank has already completed the cycle it might be a case of the bacteria building up to compensate for the added fish load?
Is changing 50 - 60% of the water once or twice daily out of the question?

 

[LadyDay]

What is the volume of the tank, how many and what kind of fish have you added, if the tank has already completed the cycle it might be a case of the bacteria building up to compensate for the added fish load?
Is changing 50 - 60% of the water once or twice daily out of the question?

It's an 80 liter tank. It has two Lyretail Killi and now 4 Microdevario kubotai (down from the 11 I put in Saturday. The two young Killi have been in for a week now). I am already changing that much water twice per day. Using used filter media would be in addition to lots of big water changes, not to replace it.
My boyfriend also just pointed out that I could potentially transfer Assassin Snail eggs, which I also don't want in the new tank. So if it's not needed to use the old filter sponge I won't. However, I really want to protect my fish to the best of my ability!