Only posting this in DIY because I'm not really quite sure where else to put it. This may sound like a very stupid question, but I remember reading somewhere on a reef forum that constant flow from a wave maker against the corner of a tank caused the seam to burst or the glass to crack.
While I understand that the flow of my canister filter exerts nowhere near the pressure that a wavemaker does, I am still curious if there are any adverse effects of pointing your filter flow somewhat directly against the glass, at a slight angle? My filter is a Filstar XP-S in a 22 gallon rimless, and the flow is way too strong for my tank (when my fish are seemingly resting their fins are constantly moving, or if they stop moving their fins they will pretty much be pushed towards the other end of the tank).
To aid in reducing flow, I directed the filter flow pretty much right up against the back glass and used a piece of driftwood to further divert the flow. This created a sort of upward wave along the back left corner, however it greatly reduced the circulation within the water column and I notice that my fish are much more at ease. Wondering though if this is adding stress on the back left seam?
Again, I'm sure this may be a face-palm moment, but my gut reminds me that I read something detrimental along these lines a while back. Better safe than sorry, yeah? Please see the video below to see what I'm referring to; sorry about the poor quality, it really gets reduced during uploading.