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PO4 and Eusteralis
Hi to you all,
may I throw in my observations concerning PO4 levels and growth behaviour of Eusteralis stellata. The species of E.S. I want to talk about can be seen at the AGA showcase 2001 site, small category, entry #62. Let me stick to Eusteralis stellata as the name of this particular plant despite some debating on the APD a couple of months ago about whether the name is correct or not. Iíve watched E.S. for two years now and experimented a lot with fertilizer levels. Itís a well known fact that from time to time E.S. stops growing without obvious reason only to put out a couple of new shoots at the tip a few days later.
What Iíve done is I switched PO4 dosings (liquid form) from 1 or 2x a week onto a daily basis. To my surprise since that time (Sept. 02) the plant grew beautifully without stunting any more. I suppose that either high pulses of phosphates in the water column stress Eusteralis or the plant doesnít like PO4 going all over the place. I concluded phosphates should be kept very stable.
As to grow Eusteralis I suggest adding PO4 daily and to shoot for 0,13 ppm. Phosphates should be tested for about 15 - 20 minutes after fertilization right before the plants have taken in a noticeable portion, but of course after being well distributed in the tank. 8x 0,13 ppm of PO4 add up to 1,04 ppm which is the amount a tank would typically consume in about a weeks time as Tom Barr has pointed out recently.
I should say that I add PO4 from Na2HP04. I really donít know if the source of PO4 makes any difference.
Other tank parameters
K+ 15 - 20 ppm
KNO3 5 ppm
CO2 30 ppm
Ca:Mg ~3 : 1
GH/KH 45 ppm
3,4 watts per gal (3x ADA-NA, 1x Dennerle Trocal 3085)
Fe and traces separately and both daily via ADA products
Anyone else out there having similar experiences (Steve Dixon, Cavan)? Anyone who can grow Eusteralis long-term WITHOUT STUNTING and ALONG WITH fertilization HIGH PO4 amounts two times a week (2x 0,5 ppm) or only once a week (1x 1,0 ppm) ?
I use a very accurate brand of test kit from a german company called Macherey & Nagel
(serves the U.S. market also: Macherey - Nagel, Easton, PA 18042, phone 6105599848)
which allows PO4 levels to be determined down to 0,03 ppm.
Well, may be things arenít as simple as stated here. But I got the feeling that they are.
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