Ok here is some general questions for you guys.......
I have either a 30 or 35 us gallon tall aqarium i want to do it as a community planted tank and I have questions on set up options for this tank...I may sound stupid but i just want to have a super grow tank that has cool fish and mainly awesome plants.

1. I have seen in many tanks at this fish store in colorado. Called primer reef and pond.... anyways they have these co2 things that add co2 to the tank but was not sure it is needed for sure.

2. Filtering I have a 55 marienland filter or undergravel with power heads or hang in the back filter.

3. Since my tank is tall I was wondering if about the lighting if i should use something different from normal tanks since most of it is hight not lenght.

4. What would be the max amount of fish that I can have and still have a quality tank with fish....I want marble angel fish, grammies, neons, pleco, gostshrimp,glo's and a small cat fish.

well the co2 is needed for photosynthesis if you only have plants in the tank, might be needed. but since youll have fish, and fish produce co2, you dont need that

its been awhile since i had a underground filter so i dont know what would be better. the hang on filter defiantly be be more then, especially being that your fish are on the smaller side. just do a gravel vac to clean the gravel out. screw it, if you have them both on hand, use them both. the more filtration the better.

i have a 35 gallon hexagon tank setup (which is much more tall then wide) and i use a normal 10 gallon light, it works perfect so you dont need any special lighting.

and last if you drop some of the larger fish you could put a ton of small fish in there. but i would only get one angel fish, they can get about 6 inches but dont produce nearly as much waste as chichlids. ive never had groumies, but dont they get pretty big? maybe they are a bad idea. id get a 2nd opinion on that one. ive seen monsters.... the neons, glo's and ghostshrimp are all tiny you could have a pretty decent amount in there. definitely drop the pleco, they are gonna get too big. check out the hillstream loach( also called a stingray pleco but its not a pleco...or a stingray) or those small algae eater things (they are called oct-something i cant remember) for algae control. and for the catfish, make sure they dont get too big. stick with a cory of some sort.

the only prob is that im going to try and have a complete ground cover with dwarf grass so that is what i was worried about the gavel vac since its going to have lots of the grass all around the bottom ya i was thinking of just one angel anyways the grommies are like max 4" and not huge pretty decent i was just going to do two of them and i just wanted to have a lil variety in size since the neon's and glo's are same size and i was thinking of dropping the pleco all together and go with a mystery snail and ya cory type of cat is what i was thinking of going with but def thanks for all the help with all that but for filtering i am going to use my marienland filter since its for a 55 and i love them so much they are great filters for tanks i use it exclusively in my oscar tank and have never had a prob. but def thanks on the ideas for the fish im huge into seeing movement in fish tanks cuase in my 90 gal oscar tank has a pleco, banded leporidus (who is super agressive except in my tank now), red belly pacu and two columbian shark catfish, but dont fret i know my tank is still a little on the small side but im saving up for my largest tank ever which is going to be 150 gallon.

no problem. sounds like your gonna have a nice tank setup there. im actually working on setting up a community tank like that as well. so far ive picked up 7 neons and 5 khuli loaches, i also have 3 clown loaches that ill put in when i know the tank is set. i dont wanna lose them. and the rest is still in question. i really want to fully plant the tank, but ive had absolutely no luck with plants in the past. i also have a banded leporidus with my o's and hes pretty aggressive as well. but he hangs out in his cave, and the os and firemouths know not to go by him. good luck with your tanks!! looks like ur hooked like the rest of us haha.

Ya I have grown um with oscars and community tanks and even saltwater tanks in my life my father was huge into fish tanks I cant remember a time where my fathers house didnt have a fish tank with something in it.

another question is i like to bury air stones in my tanks and i was thinking of doing that again with this tank but i was wondering if that might adversly effect the plants. but pics i have seen of planted tanks have been no sign of air in it.

CANT GO TO FaR INTO THIS SORRY AS I AVE LIMITED KNOWLEGE WITH AQUATIC PLANTS BUT I CAN TELL YOU ALL PLANTS breathe in carbon dioxide and out oxygen and animals and humans the reverse hence the co2 gas injector apparatus used in planted aquariums not air ......hope this helps

some people uses CO2 injector to dispense CO2 in
planted tank. i do have plants but they are not
submersible. i am practicing aquaponics wherein
my plants thrive in the open box overhead filter.
roots uses the nitrates and nitrites to keep my
water in good condition at all times. if you will
read my old thread about minimal water change,
you will have an idea of what plants i have.