Search the Community
Showing results for tags 'phosphorus'.
Found 2 results
Hi all, I've recently upgraded a few things in my 2ft (20 US gal) planted tank to get it towards the "high tech" end of the spectrum. It's running 2x24W T5HO bulbs at 6500K and 10000K along with pressurized CO2 on a solenoid running at about 1.5bps (for the moment) and is filtered by an Eheim 2215 with an inline CO2 reactor. Prior to adding the CO2 I was adding API CO2 booster (excel equivalent) and micro-nutrients, then gave Seachem's NPK a go, though dosing fairly conservatively and dealing with a lot of thread algae during that time. It currently houses 13 rummy-nose tetras, 2 black phantom tetras and 2 juvenile SAEs (smaller than the tetras) as well as 2 riffle shrimp and 15-25 Neocaridina shrimp at a guess. Moderately planted with Blyxa, dwarf hairgrass, a few crypts (wendtii, balanase, parva), Hygrophila difformis, stargrass, pygmy chain swords, and another stem plant species that I can't recall the name of. Since adding the CO2, growth has increased dramatically in the stem plants, but I am still battling with the algae. So much so that I had to severely cut back most of plants to remove the majority of the algae-infested leaves. Ideally I would like to use the Estimated Index for dosing but with Seachem's NPK that will become a money pit unto itself... and sourcing the dry ferts seems rather difficult here, especially KNO3. Regardless, my questions are more about the nutrient balance in a planted aquarium. Quite a few products that are sold as "complete" plant fertilisers specifically state that they are nitrogen and phosphate free, containing mostly potassium, magnesium, sulfur and calcium, and claim that sufficient N and P produced through feeding and fish waste. Is this likely to actually be the case in a high light system? My understanding is that ammonia is the primary driver for most algaes, at least in the spore stage and that plants are more likely to utilise N and P than algae, provided that other parameters are reasonably good for plant growth. Given the relatively high bioload, is it likely that the algae is benefiting from the immediate form of fish waste (ammonia) and then the plants will be struggling to find enough available N and P, hence I would need to supplement them directly with nitrogen? I haven't seen many obvious signs of deficiencies in the plants themselves, just an excess of algae on some leaves and an increase in green spot algae on the glass. Is that also a sign of there not being enough P in the system? If I dose according to Seachem's calculations and ideal nutrient levels I'll be using 100mL of each in under 2 months... but would providing less NPK than recommended contribute more available nutrients to the algae than the plants? Thanks for your feedback - I'm also interested in anyone else's experience with nutrient dosing and higher tech tanks... problems, solutions, stories, etc. Cheers, Piet