For those of you that have tanks that got fine sand in them, how do you guys maintain it? For me I got .5mm silica sand that does not easily get sucked in the syphon tube. Was wanting to mix it with alittle finer and coarser grit but, I'm concerned that I'm gonna suck the finer grit when I do "gravel" vac. I'm going to have a bunch of eartheaters in the tank and was wondering if I still gotta sift through it to rid of dead spots? ATM my tank with the .5mm I find wen I do my weekly vac I find some gas bubbles and it concerns me a lot and wonder what's causing it. The inhabitants are mostly clown loaches, SD's, n severums. Thanks for any help.