Hiya Angel. You can get by with regular gravel for plants if it's fine enough. Around 1/8" - 3/16" is okay. Any larger and sometimes the plants have a hard time anchoring. Also, there are benefits to specialized substrates, like extra minerals and such, but you can supplement the roots with fertilizer tabs if you need to.
Any idea of the spectrum of light? Somewhere it should tell you the Kelvins (color temperature rating) which can be important. However, I've got a 10g that just has those little spiral compacts, and the plants (easy keepers) were fine.
Extra nutrients can come in a week or so. You need to let the plants establish themselves in the tank first, and get whatever they can from what's in there. When they start to deplete available nutrients is the time to start fertilizing. You'll know, because they'll start to look weary. A cautionary note regarding fertilizers...there is a balance in a planted tank between nutrients, light, and CO2. When there is alot of light, plants are more rapidly engaged in photosynthesis (the conversion of CO2 & H2O to produce carbohydrates, or sugars)...therefore they often require an addition of CO2 to the water. And when they get that they will eagerly and rapidly eat their way through all the nutrients in the tank and need some supplementation (fertilization). They need the CO2 to utilize the added fertilizers, and they need the light to make use of the CO2. Too much fertilizers without added CO2 and you run the risk of feeding algea. It may take you some time to get to understand what your tank requires to maintain this balance, and going slow won't hurt.
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1 cambodia plant
Do you mean Cabomba?
IME, Wisteria and Cabomba are pretty easy keepers. I don't know Afzelii, but if it's a water plant I'm sure it's fine with fish (more likely some fish are not fine with plants!:lol ) Sometimes lps like to sell non-aquatic plants as aquatics...>: ...if you ever see a plant starting to wither and melt completely, then take it out. Submersible or not, it's just polluting the tank.
Keep asking questions, Angel. I hope you enjoy your plants.:)