lid rust is an issue indeed, but it takes a while.
one would note i use plastic or open tubes.........
for fert 7-7-7 is where i start ususally.
not enough to shock anything , but enough for some color.
one of the trix on all this is adjusting nutes to light.
as one uses more power LED and other high energy lights, one needs more nutes.
serious lights and fast growth, cactus will run pale, so one would move to 10-10-10 , ( in 3 steps / 2 weeks)
as they color up, back off, and alwys keep in mind there are limits, they can be salt and pH shocked,
and damage isnt always apparent for days or weeks.............
we can explore this line of question in this thread.
this method does make lophs and pereskiopsis really grow at a fast clip.
nute and light needs must be balanced indeed.
my answer to forum clutter is this XHTTL flagship thread,
wich is primarily what i do and present for actual cacti grow-0-rama,
AND,
my " annies daily cactus" thread in general discussion,
for all other cactus and associated "annie land".
keeps it simple, beyond that, i comment on threads when i see a direct need.
make every thread/ comment count.
i DO have several other cactus teks i intend to publish such as,......
( all direct spin offs or side teks from this basic XHTTL thread)
annies seed teks.
annies advanced hydro and LED system designs.
annies advanced re root and " aerophora" ( really really good new stuff)
and probably gonna do a " greatest hits"
with bizzare stuff like........
sushiphora, alienophora, loph racers, team carrot,
an all new "super lophs stress test" and tissue cloning...........on gels of course,
( you know , all the stuff that left the other forums aghast)
expect lophs on nylon also.......
and most of all, ( drum roll)
a pereskiopsis thread unrivaled.
( with associated grafting techniques for lophs en-masse)
stay tuned.....dont touch that mouse.
its all here on sacredcactus.org.