Finding fish for 55 gallon aquarium isn’t difficult. This is a descent size tank actually. I just highly advise you getting a descent quality filter. A lot of them are terrible quality. Buy the best. Here is the link:
Aquaclear 110 Filter: http://amzn.to/2A0a9EG
Added Fish tank filter:
The brown roots don’t so much matter when removing all that shit IME. They will grow new roots and attach to whatever you put em on. Just try not to break the green rhizome. If you let it soak outside of the plastic basket it will all become soft and basicly expand and break apart mostly on it's own. By then it's very easy to just pull apart and the roots bascily slide right on out easy peasy.
You can easily cut where there is the red line it won't hurt your plant. Then put it under running cool water and remove the rock wool with a fork. Starting walstad method filterless vase. Yesterday squeezed a healthy filtermedia from my 4 years old tank and now these debris are every where should i do a waterchange? How long will it take to be safe for fish after squeezing the filter media?
You still need to have a filter running for the first few months if you want to add fish, until the plants are fully established and producing enough oxygen to maintain a healthy environment for the fish. Not sure those few you have in there are going to quite cut it. I go without filters on many of my tanks. The fish/shrimp have no problem. As long as the surface of the water is exposed to open air, the water should have a stable oxygen level day or night.
I have Walstad Method on my 75 gallon tank, but I still use filters to keep the water clearer. I top off for water changes. Every 6 months I change 25% of the water. Lots of full grown plants. You would gravel vac to simulate how water moves in nature, and have a powerhead to move the water (like a natural river, or lake) the only use of the filter is to hold a ton of BB to process the ammonia and nitrites and nitrates, walstad means the plants and fish are in balance with no extra filtration.
Hmmmm I'd do a little more homework on the nitrogen cycle first to gain a better understanding of what your doing before you put living breathing creatures into that small space. You say 2.5 gallons but with that amount of substrate you’ve probably taken up a two thirds of a gallon. It’s way to small for a betta. Go for some shrimp instead. Substrate should only be 1-2” thick I think, you may have gas buildup under/within the substrate that will bubble out toxic gas. How thick is your substrate? It looks very deep.
sorry for late reply, I’ve been very busy today. All the Val I’ve kept does wonderfully with low light, the sessiliflora does alright, for me it’s hit and miss sometimes I find that it melts and makes a mess because it literally falls apart when it’s not happy. But I have it in low/medium light and it’s alright, not my favourite plant at all. Wisteria, love it, grows exceptionally well under ALL conditions, hydrocoytle same, grows very well happily under all conditions for me but I don’t have the tripartita planted, I have the much larger variation leucocephala, I’ve actually had the tripartia in a very very neglected vase of just water for like six months and it grows great under extreme neglect. Aaaand bacopa is foolproof, best, easiest plant, can’t kill it if you try. I hope that helps.
Skip the fish for that tank. Get yourself some neocaridina shrimp (aka cherry shrimp) and maybe some nerite snails (not too many or they'll starve). And add more plants and/or moss. The shrimp are available in red, yellow, orange, green, blue, brown, black, and white.
reason why I say remove it because it's easier to replace the plant now rather than let it get a hold and spread throughout the tank because this stuff can be a nightmare to get rid of. It's just on a leaf. Anyway my parameters are fine except my phosphate is a bit low. Other than that it's been fine. I'll provide it. Its because of your setup with your hardscape. Spotlights are used a lot when you are going to have exposed hardscape with no plants for this reason. Once you reach a certain level of lighting it becomes difficult to keep the algae off the hardscape. You can try manually removing all the algae and then covering the wood in moss.