No nitrates, but phos rising.

[Foo]

How do you deal with that?

[inky]

Can you post more details about the system? SantaMonica will state your lighting is not strong enough. Give us details and let's ee how we can help

[Foo]

My tank or scrubber?

[inky]

All, as size of tank, to size of scrubber will make a difference. Upflow, waterfall, size, lighting period, lighting quantity and type, water/air flow all have a bearing, so the more information provided, the better the help for you :)

[Foo]

2ft cube approx 200L after displacement. 8x24w t5 lighting on 10 hours a day.

2 Cinnamon clowns - 2" / 1.5"
1 Midas blenny
1 chalk goby
1 small yellow tang
1 small regal tang

Tmc v2 400 protein skimmer.
Waterfall turf scrubber screen is 6x8" lit 18/6 by 20w cfl bulb, 1 each side. With reflectors. 1000 l/hr pump on it.

[Garf]

Your screens only been going a few weeks, and the growth (guessing) is probably not upto the job yet. How did you used to control phos? I would continue it until you get some decent growth on the screen (once again guessing without any pics to look at).

[Foo]

A reactor. Nitrates are undetectable though so phos can't drop?

[Garf]

Actually algae can grow straight off ammonia (actually preferred) before it turns into nitrates, but that's a side issue. I would run GFO to keep it down for now, but others may not agree with this.

[Floyd R Turbo]

Check Potassium, use Salifert kit, dose if below 400. All tanks I have tested that run a scrubber have K below 350. All that don't have K above 380. scrubbers uptake K.

[Skinnysloth]

Check Potassium, use Salifert kit, dose if below 400. All tanks I have tested that run a scrubber have K below 350. All that don't have K above 380. scrubbers uptake K.

What product do you use to dose potassium?

[Foo]

Thanks I will do that. Happen to have a good kit, the kz one.

For the above post. Kz do a good potassium supplement.

[Floyd R Turbo]

I read that the KZ kit was good, then the review I read on the Elos kit said the Elos kit was better, so I got one. I discovered the Elos kit was horridly ridiculous, and the Salifert kit was super easy and reliable.

I use Brightwell Potassion-P for now.

[mess7777]

GFO worked for me. Once my nitrates ran out the phosphates started creeping up. The screen still grows, I find I don't need to clean it as often, and it probably helps the GFO last longer as well.