ill take a shot, aquasoil is a type of substrate. some folks use that or other soil type substrates, and some of us use gravel, they can both work well with plants. i would go ahead and use a dechlorinator with your plants. plants can definately handle chlorine, and ammonia better than fish but no point in stressing the plants out. many of us, myself included have adopted aquarium co-op's easy green fertilizers. they seem to work well, and as the name implies are easy to use.