Big Problem!!
 

whats wrong tanks is 3 weeks old, change a week ago
50% water and put in sera floredepot (makes bubles)
water whas very cloudy , now is almost gone except smell
and plants got a slime (white) coating on plants turn brown whas wrong too
much fertiliser for plants or too little changed too much water?
can the baking soda react like this that ithrowed in to increae the ph and
hardness?
plz help urgently plants a week old.
thx