Re: Elevated Phosphates
> The substrate is gravel, with a lower layer containing some laterite,
> peat and Delaware Imports tablets.
I would suggest you stop using the Delaware Aquatics tablets. At one
time they were known to contain nitrates and phosphates.
> Most plants grow, but in a stunted manner.
You didn't mention if you used other fertilizers. I doubt if DA
tablets are complete enough. The suspicion is that they are simply
> 2) I bought several pouches of Phos-Zorb, which I am using one at a time,
> replacing it when phosphate levels stop dropping.
Some types chemical filtration are non-specific, i.e., they remove
other trace elements as well. I don't konw about Phos-Zorb
specifically, but PolyFilter removes all kinds of good stuff.
> 3) What levels [of phosphate] should I realistically try to achieve?
Less than 0.1 mg/l.