Miracle Mud..to try or not got go there?

[naesco]

Have no experience with miracle mud but in reading about it it was my opinion that the general consensus is that it is not worth the cost.

BTW a toby requires a minimum 30 gals and a cardinal 20 (You have two of them)
When fish vendors post these minimum requirements, you can be assured they are minimums.

Don't be surprised to have a fish highly stressed with resulting problems and the toby nipping at the cardinals.

Remove the fish and get a couple of small fish suitable for a 10 gallon.