Default Substrate query - advice needed

Has anyone any experience of using the red substrate, as when I stir the black gravel layer which is above the red substrate in my tank, I'm getting quite a lot of gas bubbles appearing. I am quite tempted to remove some of the red substrate and mix it with clay and add the black gravel layer on top of that. I've had my tank set-up for approx. four months now and I've always had this problem with the gas bubbles. I would really appreciate any advice or suggestions as to how I solve this problem.

 

Re: Default Substrate query - advice needed

Hello Tom,

No it is not stinky, but I have a little problem with algae and I was wondering if that could be my substrate.
I am dosing 2.5 gr. KN03, 0.2 gr. KH2P04, 2 gr. K2S04 and 5 ml. Flourish 3 time a week (1day macro the other day micro).
I do 40% WC every week (40 G. aquarium).
My other problem is the temperature witch is 32ºC but I haven’t read any where it could cause algae.
Thank you for your advice.