Just needing to know how to add ferts for a setup that has no plants except for a 30g plant filter full of Hygro polysperma....?

The setup is the main tank (40g, no Plants), Sump (40g, no plants), Plant filter(30g, Plant-only).

I have fully planted tanks and I understand the overall fert deal. What's confusing me is how much P and K and micros to dose for the plants to remain healthy and remove nitrates. If it was Just a 30g planted tank: I would dose 2ppm of P and about 20ppm of K. BUT its a 30g plant filter inside a 110g system ----So, how would I dose this?

TIA

You can dose when you do the water changes directly to the plant filter.

There's no flow for a few minutes, the longer, the better.

I'd add about 5-10ppm of KNO3 once a week.
1 ppm of PO4
10mls of Traces.

Etc...........

You'll note you are after a balance of low nutrients, but not so low the plants suffer. So that is a balance.


Regards,
Tom Barr

Ok, so I'm assuming that you are saying dose the entire 110g to 1ppm of P, etc, Correct?

No, just the 40 gal with the weeds.

You will have a good sized fish load in the other tank right?
That should feed the plant filter.

You can add a bit more ferts for the plants there, but not that much, the rest of the tank will have no draw of nutrients.............

Regards,
Tom Barr