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Looks good!
For your rotala sp. vietnam... it could be rotala wallichi instead (especially if you bought them from C328 ). Wallichi have the characteristic reddish leaves at the top sections of each stem.
Yes, the inlet and outflow pipes should ideally be placed together on one side of the tank, and the in-tank Co2 diffuser though be positioned directly opposite the outflow... it should create a circular flow pattern which pushes the Co2 bubbles downwards and across the substrate where all the plants are. Here is a diagram can can help illustrate it:Originally Posted by Beginner2015
Source: http://www.ukaps.org/index.php?page=...h-planted-tank
Actually you can still keep that plant in the tank, stem plants gradually start to grow more densely when you trim them regularly. Each time you cut the stem, 2 or more stems will grow from the cut part, so as the plant grows, you trim it in stages, so they branch out more and more and become denser. Thats how aquascapers achieve their dense background hedges of stem plants.
Here is a guide:
Source: http://mralgae.blogspot.sg/2008/01/p...g-pruning.html
Since your plants have been growing well so far, the lights and Co2 should be sufficient... therefore its most likely shortage of nutrients, just steadily increase the fertilizer dosage to keep up with the plant's increased nutrient requirements (the recommended dosages on the fertilizer bottles are only starting estimates, you have to adjust and increase the dosages according to your plants density and growth rate).
Its seems you have most of the requisite algae eating crew for planted tanks, ie. nerite snails, cherry shrimps and SAE.
Maybe look at adding a few otocinclus to take up the role of clearing the soft algae and diatom growth on tank glass and plant leaves, they should be able to round out your algae management team quite nicely.
Adding more cherry shrimps would also improve their algae eating efficiency too.
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