From the look of all the leaves you appear to have some nutrient deficiencies. What ferts are you using and how often? Do you know your nitrate reading?
Depending on the plants you have the lighting might be too low. I'll wait to see what plants you have.
Most of the time you need to remove the hood and get something like an LED fixture for planted tanks or a T5HO fixture. Stock lighting is normally very low.
I have a German shepard that sheds like nobodies business, a Yorkie, 5 Siamese and Balinese cats and the only hair I every find in the tank is mine.
All my tanks except 3 small ones are open topped and we have dogs and several cats. We foster cats as well as have our own and never have had issues. Not much hair gets into the tanks. You would think there would be a lot but not really. If your handy you can make a cover lid out of screen but this will cut down on how much light goes through it into the tank.
Your mystery plant looks like C. wendtii bronze
Alternanthera cardinalis I would suggest medium to high light for this plant and it would greatly benifit this plant if you dosed excel or glut.
Also the dwarf hairgrass should be under high light and be dosed with excel or glut.
Seachem makes excel and in my past uses it does do a very good job.
One more thing I thought that the genus ophiopogon was not an aquatic plant do you know the exact species of this plant? And how long have you had it in your tank?
Seachem makes excel and in my past uses it does do a very good job.
One more thing I thought that the genus ophiopogon was not an aquatic plant do you know the exact species of this plant? And how long have you had it in your tank?