Well, it can't be any clearer than that.
Thanks Dave.
Is it better using the external reactor than the in tank version ?
A bit of background might help at this point.
the tank in question is a Juwel Rio 400 litre, fitted with a Rena XP3 external filter and Vecton 15w UV as well as the internal Juwel filter fitted with a Nitrate sponge.
Lights are 4 x 36w Arcadia T8's (2x Original Tropical, 2x Freshwater) with reflectors.
Substrate is not great for plants being very fine Roman gravel.
Fish are currently 10 Clown Loach, 4 adult Angels, 12 Corys, 1 SAE, 6 Danios, and about 10 Platys.
Plants are not great either, being a selection of Rotala Macaranda, Vallis (straight and twisty), Amazon Swords, Hygophillia, Onion plant, some crypts, and some dwarf grassy thing.
I add Flourish weekly.
The pH is usually on the low side and can drop, although with added coral gravel it's about 7.0-7.2.
Just now it's 6.6-6.8. Nitrate varies between 10-30.
I change 25% water weekly whilst cleaning the gravel with a python.
Peter
As to refills locally, I think that is a no go
Disposable cylinders or the 5kg fire extinguishers I linked to. To be fair a 5kg cylinder at 40quid will work out much cheaper than refillable 500g cylinders anyway.
Sam
And they fit the german ebay kit ?
Peter