normally when u put ur SH into ur tank , thier color shld be yellow or wad.. how come urs still black.. and can see tt u stress ur SH too much.. as u juz put in too much SH in one go as wad ONG sae... not to flame u but to tell u not to put it in all at one go.. they are too stress.. think for the good thing. maybe they helping u to block those bad thing.. right.. hahax. this is a challenge to u bro.. stock them up slowly.. this is a lesson for u too.. u will do better next time.. don give up.. okie..
Cheers..
Lorenzo..