10-01-2011, 11:08 AM
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First to respond on the previous question(s) about the light:
Saint fu, what is the tube you now have? And what is the length of your 38g tank?
n2fish, the tube you mention is OK as far as spectrum. Over a 36g it is probably pushing it, but low and most moderate-light plants should be OK.
I have a single T8 24-inch tube over my 29g which is 30 inches length.
Second, to the question about plants and space. It depends solely on the fish. If the tank has active swimmers, planting around the sides and back with open swimming space lengthwise in front is essential. This would be required for barb, danio, some (but not all) characins. Opposite,. if you have quiet-water fish like gourami, pencilfish, rasbora, many characins, dwarf cichlids...a jungle will suit them fine. Some of these (gourami) occur in swamps and weed-choked ditches.
Unless the tank is overstocked with fish, you will not have any issues with oxygen/CO2 no matter how many plants (and assuming you are not adding CO2 by diffusion). A natural planted tank looks after itself.
Last edited by Byron; 10-01-2011 at 11:13 AM..