thanks alvin.
it's has 4 mouths and i thiink might be splitting.
wonder any bro using fans experience the same thing as mi. as recently keep raining and the room temp is relatively cold, my own tank can maintain it's temp at 26.4 with only one ac fan. unless my digital thermometer spoil .
decide to do another pico tank. trying again.
using one prizm at the moment . the other will be for my pico tank. maybe just some interesting invert or something my family or galfriend like.