10-17-2010, 08:15 PM
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Yes, I am not confident that there is sufficient nutrients in enriched substrates to handle Echinodorus. But I would let the plant growth guide me; as I said, if the new leaf growth is green and does not yellow in a few weeks, and existing leaves are not yellowing (except if covered in algae, that's different), I would leave things as is; but any sign of yellowing on swords, increase the nutrients and Flourish works fine in my experience.
Algae is odd; it can appear in this tank but not that tank, even when conditions are identical. I also find that it goes through phases. I've had issues with various types of algae and except for reducing the light period, I generally do nothing and it often will dissipate after several weeks. And when I say reducing the light period, that was once from 12 to 11 hours on all tanks and it did help to reduce the increase of brush algae.
Another thing is to change the tubes when they need it. As tubes burn, the light intensity reduces; we used to replace the T12 tubes (the wide ones) every 12 months, though Karen Randall said it really should be 6 months for those. The T8 (narrower regular tubes) are usually said to be OK for up to 3 years though some still say 12 months. Last week I replaced one of the tubes over my 70g, it was a T12, when I noticed that it did not seem to be "on" but it was, it was that low compared to the second tube (a T8). So I replaced it; the algae problems recently in this tank dissipated within the week. Many say algae will increase as tubes wear out, seems it does. Not saying that is your issue, just mention it as there are many variables in all this.