thanks for your great advice.
i live in a tropical country,singapore and temp is hot stable around 28-30 degrees.
i did not want a power filter as they will raise the temp higher than 28degrees. as shrimps cannot take high temp.
but then again, as you have advice. i have a 1600L/hr 4ft (over head)OHF filter which i might re-used again for this planted tank.
i really like the LED lights but was worried than it is too weak therefore i plan to plac my tank near window for some sun daylight and compliment by the LED.
i bought IKEA LEDBERG 3ft LED lights but they are warm white yellowish and very weak.
thanks i will use bog oak to lower PH
as for shrimps i will go for cherry red shrimps first