So I finally got a silver arowana. It is only 2 inches right now. I cant wait to watch him grow. Ive read that they grow an inch a month. But onto my question. The aro is in a bare tank by himself right now. No substrate just bare glass. I have been doing regular cleanings of the bottom but i was curious if there was something I could put in the tank that will scavenge the bottom of the tank but will not bother the aro. I was thinking a crayfish or crab maybe. What do you guys think. Thanks. Oh and could people please post up some pics of there tanks with baby arowanas. like 3 inches or smaller.