You could get a 3/4 to 1” pvc coupler.
For hose clamps near SW, I prefer the plastic ones.
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NO steel hose clamps in saltwater. Stainless or otherwise. Especially the cheap Home Depot ones. You can use large cable ties if you cinch them with pliers.
One day you will do an ICP and ask on the internet why are all these weird metals in my tank and how do I remove them, It isn't the iron that is a problem. Its the alloys that make iron into steel or stainless.
If that is actually 3/4" marine grade plywood it should be fine. I can't see the fasteners but if it was built as a tank stand I would "assume" they are either hot dipped galvanized or stainless steel. I would worry more about the "formica" or whatever thew sheeting is. It should be fine as long as it is not against the floor because water, especially salt water will get under it and if it stays wet, the bottom the sheathing will peel off. But it looks great.
I overbuild those things also. I used redwood because it doesn't warp and is moisture resistant. I also have very little wood on wood because any water that gets between two pieces of wood never dries and rots. All my hardware is hot dipped galvanized and all the supporting pieces are bolted through.
The top rails are cut into the uprights so they are sitting on the wood and not just bolted on so all the weight is on the upright 4X4s
My last stand was under my 100 gallon tank for 40 years.
If you can't see the picture, click on the X
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no not at all, I turned down the Hygger return pump though and the next day the bubbles were substantially reduced... I did finally turn on my skimmer too now that we are fully into the ugly portion of the cycle but the bubbles started before that and coincidentally started cutting down when I lowered the return pump's volume and added the skimmer.Are you seeing bubbles in your sump? Specifically that return pump chamber? If not, I'd hazard a guess that you might have a very small hole in your return plumbing and it's sucking air in like a venturi.