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Discussion Starter · #1 ·
Have just set-up tank 10 days ago and am now getting the onset of the first bunch of algae. It is the dirty looking brown slimy fuzzy kind... My question is, should I add more P? (or should I do something else) Here are the details:

Tank: net vol 26.4 US gal/100 litres (gross 120 l/31 gal)
lighting: 4 x 24w T5 with reflectors, 11hrs/day
wpg: 3.7 wpg (based on net vol)
pressurised CO2, ~30 mg/l given:
pH 6.8
KH 5
Nitrite and ammonia: 0 mg/l
NO3: 15-20 ppm
PO4: basically less than .25 - difficult to tell 2 different shades of very light blue apart!!

Ferts: currently using Flourish line (not excel) and have calculated using equations from steve pituch's website, what I'm adding:
Fe: 2.5 ml/day = ~.25ppm/day
K: adding ~20 ppm over week: 25ml old F. Potassium x 2
P: added 22.5 ml over 2 days: ~0.68 ppm.

Also using F. Traces, Flourish as directed. Have got the Nitrogen but don't feel I currently need it given NO3 concentration (~15ppm) even after water change (~30%). Basically am using the Seachem schedule, but trying to modify it for desired concentrations.

Substrate: 100% Flourite
Fish: just added 10 juvenile Harlequin Rasboras and 12 Amano shrimp

Plants: Glosso, Microsorum petropus (narrow) Crypt X Willissii, Rotala rotundifolia, L.inclinata var. verticillata (cuba), micranthemum umbrosum, Lobelia cardinalis and a couple of stems of Eusterallis stellata.

Reason I'm asking about P is that from what else I read, my test kit isn't really registering, despite my P dosing. On my planted discus set-up I get a healthy reading of P, >1ppm, and a nice dark blue on the test card-and no algae to speak of. Discus seem to do a great job of dosing P for me!

Look forward to your suggestions,
Thanks,
Nick
 

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Discussion Starter · #5 ·
Thanks for the tips. I'll reduce light period by an hour or so. You think I should cut-out the Fe and traces? I guess I'm trying to mainly focus on the macros to start of with. Seems to me with a light fish load P is something that is potentially deficient early on-what do you think about my K dosing-aiming for 20-30 ppm over the week.

As for the substrate, I did seed it with some mulm and also took a sponge from planted discus set-up and used that in the filter to kick things off.

Pineapple-I'm in Berkshire.

Thanks,
Nick
 

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Discussion Starter · #7 ·
Andrew,

I think the Beckhams are in Hertfordshire-I'm not sure I'll check OK magazine next time i'm in the barbers! You're right about the cold-been a bit worried about my plan deliveries for this new set-up. Nice and fresh from Tropica, they seem to have fared pretty well.

Have cut back on the Fe, and am keeping an eye on the macros-particularly Phosphate, which seems to be depleting faster the NO3 at the moment. My tapwater has ~40ppm NO3, so am replenishing that via water change at 50/50 tw/ro, giving me about 20ppm in the tank. Am aiming for 1ppm PO4, and sticking with a cumulative weekly dose of ~30ppm K. We'll see how it goes.

Thanks,
Nick
 
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