No need for a new fixture. just change the bulb. You are going to have some problems with dead undergrowth, but thats a small price for low tech.
Some root tabs will definetly help, and a light to moderate dosing regime could help here. I would go the seachem route and purchase some Excel, Potassium (this will help with the pinhole isue, but it won't undo the damage already done) and if your up to it, some Flourish.
A small dosing regime with those ferts could make you go a long way with a nice low tech setup. But the root tabs are a great place to start to help out the swords.
Note: the Hygro you have there looks to be Hygro Corymbosa which are notarious for pinholes and horrid undergrowth.
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