Here are my suggestions to keep medium and high-light plants going:
1. Switch your substrate to something smaller. Smaller substrate allows your plants to root better. You can use something fancy like EcoComplete or something cheap like PFS or play sand. I've got high-light plants and a glosso carpet in plain old PFS.
2. Get a good light. Look at either T5HO or high-power LED
fixtures. T5HO fixtures offer pretty good bang for the buck. Commercial LED
fixtures are a little pricey, but they're more efficient and you don't have to replace bulbs. If you're handy, you can build a great LED
fixture that will blow away a comparably priced T5HO fixture.
3. Get a pressurized CO2
system. 30g is right on the edge of being too big for DIY CO2
. I've used both DIY and pressurized CO2
and the pressurized system wins hands down. Once it's tuned, I've had no BBA with the pressurized setup. The DIY system output fluctuates too much.
4. Look into a fertilizer regimen. Estimative Index (EI) and Perpetual Preservation System Pro (PPS Pro) are popular systems. Mixing your own dry ferts is much cheaper than buying liquid ferts.