- Hi,first time on here so advice /cririsism will all be taken in. I'm new to planted aquariums after having a nano tank for a Number of yrs with easy/ standard plants in it.java crypts anubias etc.having recently got a larger tank I've tried my luck with different plants with helferi being one.this has started to brown in places as in the picture.planted in fluval stratum. Water is fine by my kit, dosing reuired amount easy carbo daily, lighting is an ehiem classic 17w for what came with the tankfor around 8hrs a day.could this be a problem.all other plants are doing fine.could it be adjusting to new tank? Co2 system will be purchased later in year we i can afford one so could this also be a problem?