I had my seastar tank on foam, and they were the ones who recommended it was put on foam and they even suggested pink.
now the biggest problem I see is if you are using a home made stand or even a pre-made stand on an uneven surface. once the foam is compressed it won't keep going so what happens is it will conform to the stand and transfer through any irregularities. it will make up for very slight ones but not for larger ones and they will eventually telescope through and have there effects.
I don't know if your stand was wood or metal but, I really hate it when I see people using wood to build frames for large tanks, as no matter how good you build it wood will flex and wood also will compress at different rates due to grain structure and knots, so in fact you can have a perfect wood frame compress at different rates causing unevenness and tank cracking.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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