Multiple questions....

OK first we will start with the most pressing question.

I have 2x 2 gallon tanks, with filtration and light. They each house one male Betta, algae is growing slowly and I want to add something to eat algae. I am thinking either 2xshrimp or 2xsnails, or 1xshrimp & 1x snail. There is a small place for snail/shrimp to hide and a plastic plant or two in each tank with gravel substrate. If the snail or shrimp was eaten, I could always buy another one so thats not so much the concern. I am more concerned with room and general compatibility, I realize there is always a chance. My wife just found a gift card for $10 that expires today so I need to make my decision today sometime.

OK on to less pressing questions.
In my tank currently:
55 gallon tank
2x dwarf Gourami
1x cherry barb
1xSerpae Tetra
1xraphael catfish
3xleopard danios
1xred tailed shark

I am using HOB filters(one is for 30 gallon tank from my old tank, one is rated for 60 gallon tank), 2x100W heater(looking for upgrades as we speak), 2x f15T8 lights(again when money comes around upgrading these too).

Now the questions:
1. Do I need more hiding places and plants?
2. Should I add live plants or wait until I have better lights?
3. At what point should I worry about fish chasing other fish?
(some of the fish chase each other its never for more than 10 seconds, and they lose interest before they even make it the length of the tank, I have yet to see any fin damage. The red tail chases the serpae, the red gourami chases the blue gourami, the serpae chases the red gourami no other squables. We had a CAE which went psycho when moved to the 55 gallon and he had to go he attacked everyone.)
4. After the tank is cycled (early January I would guess but I would rather be safe than sorry) What suggestions would you have as to the fish I could add. I have heard things like bolivian rams, or more serpae tetras...what do you think?

Here is the 55 gallon tank

Unfortunately I listened to my lfs back in the day and he said I only needed a pH tester. So thats all I have ever had, I realize now that I need a master test kit but with Christmas I just don't have the money for it. On the 55 gallon I did add the rocks from my 20 gallon tank, about 10-15% of the water, and the filter which are all from a fully established tank. I know thats not perfect but at least it should have given me a head start, that was about 3 weeks ago. I have not lost any fish yet. I have no plans to add any fish until the end of January anyways at this point.

I did go ahead and get shrimp(I copied this post from another site I post it on friday) I got one bamboo shrimp for each tank. In one tank the shrimp has turned a bright red and looks great, he is eating and happy as can be. The other shrimp is a bit slow moving and doesn't seem near as happy, but today I made him move off his plant and he went around eating like crazy so maybe he will be ok as well. The betta's could care less about the shrimp. The betta tanks do also have an under gravel filter and get weekly about 50%-75% of the water changed


EDIT: Do you think I should have two shrimp per tank?