best combo for sps

[Kevin Hayward]

choose one

 

[Scorpius]

I chose all them and then some.

 

[Waters]

You need all of the above (minus additives depending on the system) plus water chemistry stability.

 

[andrewey]

@Waters and @Scorpius nailed it perfectly. To choose only one is to ask whether a dog needs only food, water, or shelter