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Message: <blockquote data-quote="Whitelightning777" data-source="post: 130453" data-attributes="member: 26980">Grammostola species maule world be a great fit.There are options for ventilation in a fish tank. I just had to contend with this with my newest arrival, challenge was to maintain humidity and temperature at the same time.The first option is to cover the center of the cover and set up a hot side/cold side configuration. The hot air will rise up and cool air will move downward to replace it.The second option is to place a very small USB or CPU fan over the top and pull air upwards. These are quiet and very gentle.The third option, especially if your cover is acryilc, is using a small air stone or diffuser together with a small whisper quiet low powered air pump.The stone goes inside with the stem sticking out. A hose is then placed on the other side. The stone or diffuser will prevent any type of directional air pulse which might upset the tarantula. It need not be placed inside the water dish or placed in water.Remember, cross ventilation involves an very small amount of gas movement entering into the tank. Consider 10 pin holes in a deli cup going around the top sitting on a shelf.  How many CCs of air per day actually exchange per day? How long does it take the total air volume to exchange itself?The answer is that it's extremely low.The main requirement is that the air isn't completely stagnet. You don't want mold or CO2 or gases produced during decay to be more and more concentrated.People have been moving air within fish tanks for probably 100 years.[MEDIA=youtube]SFXKEJzomSs[/MEDIA]Everything is strictly my opinion. I reject any guru status.</blockquote>

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