Ok, you want a 30 sitting next to the 55 as a refugium. You need one pump inside the 30 and an overflow/gravity drain in the 55. A hang on overflow is pricey and kinda difficult in power outage situations where you need a vacuum pump to restart the overflow.

You need to drill or have drilled the back glass of the 55. It's not that hard and I have done it on many tanks that are even tempered. This can be done by draining the water down about 6 inches below surface and putting a hole at least 2 inches below the top of the glass. Insert a 1.5inch bulkhead and use a 90degree elbow with a conical screen but don't glue the elbow. You need to be able to turn the elbow to adjust the water level in the 55.

The 30g tank will have to be lower than the 55g for the purpose of the gravity drain. Use a maxijet 400 or 600 in the 30 with 1/2in tubing to pump water from the 30 back to the 55.

Nutrients for the refugium will be a constant variable which you will have to monitor.

Since adding my 29g Xenia scrubber, my nitrates have fallen from 10 to 0 and I have had to increase feeding on a week to week basis depending on how the Xenia looks. When the nitrates stay at 0, I have to gauge how much to feed based on the growth of the Xenia.

I have no Idea about the Seahorses since I have now experience with them.

Same height makes it a lot harder. Synchronizing two pumps is near impossible. Think about it. You're pumping out of a tank of one size and in to another and vice versa. You'd have to have electric mircro switches for each pump.

Drilling a tank is very simple for someone who has done it a few times. Anyone local in the club?

Drilling is simple and cheap, if you're not afraid to drill or have someone with experience drill.

Pimp . . . . . i have 90 acres of family land to ride on and the farm is surounded by three of the largest fruit orchards in NY state - - - come on out man!!!!!!oh yeah bring the goods too...hehehehe

Boss