As said above no need for tabs but you can add them if you wish. Co2
is a must for plants like DHG and HC Cuba. These also require regular trimming to get that nice carpet effect! (Every 10 days or so)
You might want more lighting depending on how bright it is. I'm a big fan of LED
's due to being able to dim them to the required light.
Don't waste your money on DIY co2
. Get pressurised straight up as a paintball setup will last you a fair while before tank changes and it's much easier to hit that 30ppm target. Set and forget!
Aim for 10x tank turn over with your filtration if you can get it (not a must but good flow is important).
As stated above high light setups are best fertilised with PPS pro or EI dosing.(direct dosing with dry salts)
No need for the sand unless that's the look your after. Plants will carpet just fine with Eco. You want a substrate depth of atleast an inch and a half.
Hope I've helped