20 gallon planted tank? help!!!!

I have a 20 gallon tank. with marineland 350 bio wheel filter , and a marineland single led lighting. i currently have sand in the bottom from top fin . Inside the tank i have 6 bleeding heart tetras,6 black skirted tetras, 3 mollies,6 skirted tetras , and to tiger snails at the top of it there is a breech with wood which has 2 red claw crabs. so as you can see i have a pretty active tank. i really didnt want to plant this one but over time i started thinking about planting it . would it be smart to plant the plants just in plain sand or should i have a bottom substrate of eco complete or flourite or can it just be sand ?

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Comment by LED on June 1, 2014 at 5:08pm: if you leave it with just sand then you can dose with nutrients. something like seachem flourish or other products. If you decide to get plants be wary of your crabs eating the plants. they like to graze on plants.

here are some other crab keepers who have had the same issue

http://www.fishforums.net/index.php?/topic/28975-red-clawed-crab/

happy reading.

Comment by john walden on June 2, 2014 at 12:14am: thanks so much with the help

Comment by LED on June 2, 2014 at 2:51am: Im hoping others can jump in on this blog but i guess its easier to post in forum. sometimes people look at forum more intently than a blog. if you check around on the forum discussions you can find some ideas John