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Selective Thermal Damage?
Due to trout fishing, lack of observation, and a defective heater /
thermostat, one of my tanks reached 85 degrees, and had probably been that
warm for about a week. the temp is now back to 77degrees, but my Dwarf
Amazon Swords now are doing poorly while everything else in the tank seems to
continue to flourish. The other plants include Crypts, Anubias,
Valllisneria, Anacharis, Wisteria and magically multiplying duckweed. When I
first planted the Swords back in February, they shortly attempted to take
over the world. The original plants sprouted densely and sent runners
completely around the periphery of the 15 Gal Tank The swords display
classic signs of iron / trace element deficiency despite the fact that I have
increased PMDD dosing significantly. Fe is probably in the .4-.5 range. GH
is very high, probably around 18-20 while KH hovers in the 4-5 range.
Nitrates around 20 ppm. PH is 6.9. Substrate is Flourite over Kitty Litter
laced with Jobes fragments. Tank was established last January. No trace of
Algae of any kind
I have also Jobed the Swords lavishly to no avail. Could I have injured the
Swords permanently by overheating or do I have something else out of whack?