need help
 

looking at the waterline in my 220g tank (8x2x2) and have notice the waterline changing(left to right). about 3 weeks ago the right side was 6 mm lower(measuring from bottom of trim down). i looked today and the left is 5mm lower than the right end (measuring from bottom of trim down). the tank has been running for about a year. the tank is on two stands, both are level (each one) and together they are level. the tank lower trim on the left side is about 2 mm high than center, the right side is is level and center is right side high. the top trim on the (bottom side of the trim) left side is about 1.5 mm lower than center, the right side is 1.5 mm hight than center and the center is right end high. the waterline is level right, left and center.by sides i mean center to end (4 foot sections), center center out. level used is a 3 foot. looking for some help.

What are you actually saying and/or asking? Are you saying that your tank stand is shifting? Your trim is out of wack? I'm really not sure what you're talking about.

Wow.........after reading that.....I think my brain is 10mm lower on the left, center, right............I think.

i am trying to find out if stand is settling out of whack and if i should correct, or if trim is out of whack and have to live with a tank that looks unlevel. is there a risk of coming to see the tank and finding a big mess.

perhaps a picture might help

I think I'd be VERY concerned if I noticed the waterline location changing (ie. indicating settling). What is the floor the tank is sitting on? Ie. upstairs/downstairs, sitting on joists, parallel perpendicular etc etc. ?

Is your trim loose, if it isn't, I'd sure be concerned with the tank tilting back and forth.

trim is on tight. tank is solid dose not move at all.

Where is the tank located in the house concerning upstairs, downstairs. If it's upstairs did you reinforce the floor or place it on top of a load bearing wall.
Super7

the floor is cement with 1x4 laid side to side leveled and with ply wood on top and leveled. have had the tank befor i had the house and redid the basement and planed for the tank to be in that spot since day one.