I have noticed a significant die off of plants in my tank my crypts have almost disappeared my ceratopterus floatng plants has also died off .The tank where these plants were did house a rainbow snake head up until february when I sold it had it for 3 years did six monthly water top up yearly 50% water change and the plants flourished. Changes came in february when I have housed a pair kribs do a 50% water change every 2 weeks I have peat in the filter and add some tetra torumin to new water could this be the problem this die off is very recent last 2 weeks even the hair algae has gone I did use tnc lite until recently and now use a micro mix although I use the micro mix in my other tanks with no issues water prams are ok a bit baffeled as the die off has been so rapid.