The whisper 150 will be VERY strong for a 38 gallon. Keep in mind you will have to bleed off a lot of air. If the pump is making noise then you have not bled off enough air. To give you an idea I put a 100 on my 100 gallon tank on a rather large bubble wand (so lots of air going out) and it was too strong for it. I put a whisper 60 on there and it's great. It's cool to use the 150, just remember to bleed off all that extra air or it will bust.
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