IMO looks like a few things ....possible overwatering and some nute issues ....dark green veins is usually a good indicator of cal/mag def ...but the over all dark green leafs also tells me your N is on the high side and that's why some of those tips are pointing down ......if I were you I'd back of on the nutes and let the soil dry out better between waterings ....as well as looking into getting some cal/mag ...GL