I am not trying to hijack your thread but I also have had no luck with HC in 125 gal. at 3.5 watts per gal and I dose EI method using dry fertz. Every time I get it, it is in emmersed form and never seems to acclimate, it always melts for me. I have grown glosso HM and currently trying elatine triandra which is looking good so far. Glosso and HM took off like crazy. Damn HC, I want it so bad and I can't grow it.
So in light of that if you are having trouble with HC I would try glossostigma and keep it trimmed well.