So my little one is almost 5 weeks now and she will get so hyper sometimes, I have her in a huge fish tank because she was crawling out of everything else. I have a heating pad on one side and a bunch of old shirts in there she loves to lay on and a piddle pad on one side where she uses the rest room (yes she's potty trained lol) well lately she's been jumping around sprinting from side to side and trying to climb out, is there anything I can put in there that she can play with or like crawl on? Is that safe?